Spark PlugCross Reference

CHAMPION 121S

Compare interchangeable spark plugs for {brand} {part}. Check heat range, electrode gap, thread size, and reach before substituting — not all cross-referenced plugs perform the same in every engine.

90 matches found

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Cross-reference results

⚠ Important: Before substituting, confirm: same heat range, matching electrode gap, correct thread reach, and compatible resistor type.

ACDELCO

15 matches

R43T49 total matches MR43T44 total matches R46T43 total matches R44T41 total matches MR44T40 total matches 1037 total matches R44TX37 total matches R42T36 total matches R45T33 total matches R42TX26 total matches R43TX25 total matches R42CT23 total matches R43CT18 total matches 41-8219 total matches 41-8309 total matches

AUTOLITE

8 matches

68567 total matches 14466 total matches 14566 total matches 14765 total matches 68750 total matches 14641 total matches 13633 total matches 68425 total matches

BECK ARNLEY

2 matches

176-519232 total matches 176-519312 total matches

BOSCH

16 matches

WA125TR4X90 total matches HR9APX85 total matches 024222952684 total matches HR8AC82 total matches HR9AC74 total matches HR10AC59 total matches HR10ACY53 total matches HR9ACY48 total matches HR8ACY41 total matches HR10AY28 total matches HR8A22 total matches HR8AY21 total matches WA95TR413 total matches WA125TR412 total matches WA145TR412 total matches WA95TR4X8 total matches

CHAMP STK

1 matches

12117 total matches

CHAMPION

7 matches

RV8C-6115 total matches RV8C102 total matches RBL839 total matches BL836 total matches 12133 total matches 121CC30 total matches RBL8-626 total matches

DENSO

6 matches

ITF20201 total matches 5331159 total matches T20R-U134 total matches T16R-U79 total matches T20R-U1567 total matches 503837 total matches

DENSO STK

2 matches

503842 total matches 502923 total matches

GM OEM NR

2 matches

561335432 total matches 56138679 total matches

MIGHTY

2 matches

M4G461 total matches M4RF46 total matches

MOPAR

1 matches

433949221 total matches

MTRCRFT PN

9 matches

ARF340 total matches ASF3C37 total matches ASF4C35 total matches ARF632 total matches ARF831 total matches AF3C25 total matches ARF423 total matches ASF4CF420 total matches AF315 total matches

MTRCRFT STK

2 matches

7529 total matches 1017 total matches

NGK

9 matches

YR597 total matches YR5580 total matches BR5FS79 total matches BR6FS76 total matches 432363 total matches 292739 total matches 362437 total matches YR55VX31 total matches B6FS29 total matches

NGK STK

3 matches

705233 total matches 432319 total matches 44888 total matches

SPLITFIRE

2 matches

SF14E11 total matches SM14E7 total matches

TORCH

1 matches

F6RC39 total matches

VALLEY FORGE

2 matches

64R38 total matches 54R12 total matches

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