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The Following brands are available based on your search.

  • Autolite
    Autolite
  • Champion
    Champion

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Shop for Top Selling Genuine International R121 Spark Plugs

  • We Stock the following top leading brands, including Champion, Autolite
  • Constantly Updated Inventory of International R121 Replacement Spark Plug Parts

We also have Spark Plug parts for other International models, including 1000A, 1000B, 1000C, 1000D, 1100A, 1100B, 1100C, 1100D, 1200A, 1200B, 1200C, 1200D, 1300A, 1300B, 1300C, 1300D, 1500A, 1500B, 1500C, 1500D, 1924 S, 1925 S, 900A, 908B, 908C, A100 Truck, A102, A110, A112, A120, A122, A130, A132, AB120, AB1200, AB140, AB1400, AM120, AM130, AM132, AM150, AM80, B100, B102, B110, B112, B120, B122, B130, B132, C100, C1000, C102, C110, C1100, C112, C120, C1200, C122, C130, C1300, C132, C900, CM110, CM75, CM80, CO180, CO190, CO200, CO220, CO4000 Transtar, Cargostar, D1000, D1100, D1200, D1300, D300, D900, F1924, G1904, G2105, L110, L111, L112, L120, L121, L122, L130, L150, L151, L153, LB140, LM120, LM121, LM122, LM150, LM151, LM153, M Series Van, M1100, M1200, M1400, M700, M800, M800 Navy, M800 Post Office, MA1200, MHC1310, MS, MS1210, R100, R102, R110, R111, R112, R120, R121, R122, R130, R131, R132, RA120, RA121, RA122, RM120, RM121, RM122, S100, S102, S110, S112, S120, S122, S130, S132, S1624, S1723, S1724, S1823, S1824, S1924, S1925, S2125, S2524, SA120, SA122, SM120, SM122, SM130, SM132, Scout, Scout II, Travelall, 100, 150, 200, 1010, 1110, 1210, 1310, 1724, 1824.


Champion
1954 International R121 Spark Plug 6 Cyl 3.6L Champion - Copper Plus

P311-4043BAA    841  New

14-4 , 14-5 , 14-7 , 14-7X , 4339491 , 44 , 45 , 4907335 , 77-317-1 , 7809 , 834225-MI , 834225MI , 834230-MI , 834230MI , A5 , A5X , A7 , A7C , A7CX , A7X , AO5999AB , AT6 , B45 , B6S , B6Y , C44 , CS3 , G6C , J8C , M44C , M45 , O5999B , S44 , SF29E , SM29E , W14U , W14US , W16SU , W8E , W8EC

Qty:
In Stock & Ready to Ship
$4.12
Champion Spark Plug
  • Champion Copper Plus Small Engine- Boxed - J8C
  • Non-Resistor Type Gap 0.030in ; Plug Type J8C
  • Champion Copper Plus Small Engine 841 Spark Plug (Carton of 4)
  • Copper Plus
  • Product Attributes:
    • Center Electrode Tip Material: Nickel
    • Classification: Champion Copper Plus Small Engine
    • Electrical Terminal Type: Removable Nut
    • Ground Electrode Core Material: Nickel
    • Hex Size:
      • 0.813
      • 20.650
    • Plug Type: J8c
    • Pre-Gap Size:
      • 0.030
      • 0.76
    • Reach: 0.375
    • Resistor Type: No
    • Seat Type: Flat
  • Dependable performance. This Champion® spark plug features a copper core electrode that provides increased conductivity and heat control for good overall wear.
Brand: Champion
Additional Fitment Information:
Vehicle Block Engine CID CC
1954 - International R121 L 6 Cyl 3.6L 220 3608
Autolite
1955 International R121 Spark Plug Autolite - Copper Resistor Spark Plug

P311-5175402    303  New

102 , 3075 , 43 , 742 , A3X

Qty:
In Stock & Ready to Ship
$8.24
Autolite Spark Plug
  • Autolite 303 Copper Resistor Spark Plug
  • OE Style; .030 Gap
  • Copper Resistor Spark Plug
  • Product Attributes:
    • Center Electrode Core Material: Copper
    • Center Electrode Design: Standard / Regular
    • Center Electrode Tip Material: Nickel
    • Electrical Terminal Type: Removable Nut
    • Ground Electrode Core Material: Nickel
    • Ground Electrode Tip Design: Tapered
    • Ground Electrode Tip Material: Nickel
    • Hex Size:
      • 13/16"
      • 21
    • Insulator Material: Ceramic
    • Insulator Type: Short
    • Pre-Gap Size:
      • 0.034
      • 0.90
    • Reach:
      • 0.374
      • 9.5
    • Resistance: 5000
    • Resistor Type: Yes
    • Seat Type: Flat
  • Autolite® Copper Spark Plugs are manufactured to deliver quick starts, improved fuel economy and smooth acceleration. Autolite® spark plugs are the best alternative to OE spark plugs, offering OE form, fit and function for all makes and models, both foreign and domestic, at a value price. Autolite provides the automotive aftermarket and Original Equipment manufacturers with the highest quality ignition products and is the leading supplier of spark plugs.
  • Suggested Purchase Quantity: 8
    • Most jobs typically require 8 of this item.
Brand: Autolite
Additional Fitment Information:
Vehicle
1955 - International R121
Autolite
1972 International 1210 Spark Plug 6 Cyl 4.2L Autolite - Platinum Spark Plug

P311-121CC4E    AP64  New

Qty:
In Stock & Ready to Ship
$8.16
Autolite Spark Plug
  • Autolite AP64 Platinum Spark Plug
  • Heavy Duty; .030 Gap
  • Platinum Spark Plug
  • Product Attributes:
    • Center Electrode Core Material: Platinum
    • Center Electrode Design: Standard / Regular
    • Center Electrode Tip Material: Platinum
    • Electrical Terminal Type: Stud
    • Ground Electrode Core Material: Nickel
    • Ground Electrode Tip Design: Tapered
    • Ground Electrode Tip Material: Nickel
    • Hex Size:
      • 13/16"
      • 21
    • Insulator Material: Ceramic
    • Insulator Type: Mid Projection
    • Pre-Gap Size:
      • 0.044
      • 1.10
    • Reach:
      • 0.750
      • 19.5
    • Resistance: 4000
    • Resistor Type: Yes
    • Seat Type: Flat
  • Autolite® Platinum Spark Plugs are manufactured to deliver greater durability compared to standard copper plugs. Autolite® Platinum Spark Plugs provide easier starts, quicker acceleration, and improved fuel economy. Autolite® spark plugs are the best alternative to OE spark plugs, offering OE form, fit and function for all makes and models, both foreign and domestic, at a value price. Autolite provides the automotive aftermarket and original equipment manufacturers with the highest quality ignition products and is the leading supplier of spark plugs.
  • Suggested Purchase Quantity: 4
    • Most jobs typically require 4 of this item.
Brand: Autolite
Additional Fitment Information:
Vehicle Block Engine CID CC
1972 - International 1210 L 6 Cyl 4.2L 258 4228
Autolite
1974 International 200 Spark Plug 6 Cyl 4.2L Autolite - Platinum Spark Plug

P311-121CC4E    AP64  New

1233 , 12592619 , 3000 , 302 , AG32 , H6D , R43XLS

Qty:
In Stock & Ready to Ship
$8.16
Autolite Spark Plug
  • Autolite AP64 Platinum Spark Plug
  • Heavy Duty; .035 Gap
  • Platinum Spark Plug
  • Product Attributes:
    • Center Electrode Core Material: Platinum
    • Center Electrode Design: Standard / Regular
    • Center Electrode Tip Material: Platinum
    • Electrical Terminal Type: Stud
    • Ground Electrode Core Material: Nickel
    • Ground Electrode Tip Design: Tapered
    • Ground Electrode Tip Material: Nickel
    • Hex Size:
      • 13/16"
      • 21
    • Insulator Material: Ceramic
    • Insulator Type: Mid Projection
    • Pre-Gap Size:
      • 0.044
      • 1.10
    • Reach:
      • 0.750
      • 19.5
    • Resistance: 4000
    • Resistor Type: Yes
    • Seat Type: Flat
  • Autolite® Platinum Spark Plugs are manufactured to deliver greater durability compared to standard copper plugs. Autolite® Platinum Spark Plugs provide easier starts, quicker acceleration, and improved fuel economy. Autolite® spark plugs are the best alternative to OE spark plugs, offering OE form, fit and function for all makes and models, both foreign and domestic, at a value price. Autolite provides the automotive aftermarket and original equipment manufacturers with the highest quality ignition products and is the leading supplier of spark plugs.
  • Suggested Purchase Quantity: 4
    • Most jobs typically require 4 of this item.
Brand: Autolite
Additional Fitment Information:
Vehicle Block Engine CID CC
1974 - International 200 L 6 Cyl 4.2L 258 4229
Champion
1954 International R121 Spark Plug 6 Cyl 3.6L Champion - Copper Plus

P311-072D77A    871  New

14R4 , 14R5 , 14R8 , 7908 , AR31 , AR41 , AR51 , AR7X , BR6S , MR44C , MR45 , R44 , R45 , RJ8C , WR8E , WR8EC

Qty:
In Stock & Ready to Ship
$8.61
Champion Spark Plug
  • Champion Copper Plus Small Engine- Boxed - RJ8C
  • Resistor Type Gap 0.030in ; Plug Type RJ8C
  • Champion Copper Plus Small Engine 871 Spark Plug (Carton of 4)
  • Copper Plus
  • Product Attributes:
    • Center Electrode Tip Material: Nickel
    • Classification: Champion Copper Plus Small Engine
    • Electrical Terminal Type: Non-removable Nut
    • Ground Electrode Core Material: Nickel
    • Hex Size:
      • 0.813
      • 20.650
    • Plug Type: Rj8c
    • Pre-Gap Size:
      • 0.030
      • 0.76
    • Reach: 0.375
    • Resistor Type: Yes
    • Seat Type: Flat
  • Dependable performance. This Champion® spark plug features a copper core electrode that provides increased conductivity and heat control for good overall wear.
Brand: Champion
Additional Fitment Information:
Vehicle Block Engine CID CC
1954 - International R121 L 6 Cyl 3.6L 220 3608
Champion
Spark Plug Champion

P311-280AE81    9809  New

IZFR6F11 , QC8WEP

Qty:
In Stock & Ready to Ship
$11.79
Champion Spark Plug
  • Champion Iridium- Boxed - QC8WEP
  • Champion Iridium 9809 Spark Plug (Carton of 4)
  • Product Attributes:
    • Center Electrode Tip Material: Iridium
    • Classification: Champion Iridium
    • Electrical Terminal Type: Non-removable Nut
    • Ground Electrode Core Material: Platinum
    • Ground Electrode Tip Design: J Gap
    • Hex Size:
      • 0.625
      • 15.880
    • Insulator Height: 0.3
    • Plug Type: Qc8wep
    • Pre-Gap Size:
      • 0.027
      • 0.72
    • Reach: 0.75
    • Resistor Type: Yes
    • Seat Type: Flat
  • Champion® Iridium - the ultimate element. This spark plug's fine-wire iridium center and platinum ground electrodes provide the sharpest spark focus for maximum performance.
  • Suggested Purchase Quantity: 8
    • Most jobs typically require 8 of this item.

    • This is a Universal/Non Application Specific Product. To install this part, you made need to cut, weld, or make other modifications to your vehicle.
Brand: Champion
Additional Fitment Information:
Vehicle
Champion
Spark Plug Champion

P311-506254E    9005  New

QC10WEP

Qty:
In Stock & Ready to Ship
$11.60
Champion Spark Plug
  • Champion Iridium- Boxed - QC10WEP
  • Champion Iridium 9005 Spark Plug (Carton of 4)
  • Product Attributes:
    • Center Electrode Tip Material: Iridium
    • Classification: Champion Iridium
    • Electrical Terminal Type: Non-removable Nut
    • Ground Electrode Core Material: Platinum
    • Ground Electrode Tip Design: J Gap
    • Hex Size:
      • 0.625
      • 15.880
    • Insulator Height: 0.3
    • Manufacturer Heat Range: 10
    • Plug Type: Qc10wep
    • Pre-Gap Size:
      • 0.028
      • 0.72
    • Reach: 0.75
    • Resistor Type: Yes
    • Seat Type: Flat
  • Champion® Iridium - the ultimate element. This spark plug's fine-wire iridium center and platinum ground electrodes provide the sharpest spark focus for maximum performance.
  • Suggested Purchase Quantity: 8
    • Most jobs typically require 8 of this item.

    • This is a Universal/Non Application Specific Product. To install this part, you made need to cut, weld, or make other modifications to your vehicle.
Brand: Champion
Additional Fitment Information:
Vehicle