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Here is a cross-reference chart for competitive spark plugs and John Deere parts listings:
Champion: John Deere: Champion: John Deere:
A25B 508R RCJ8 M71939
A6 TY26724 RCJ8Y TY6081
CJ14 AM101194 RD16 GA11417
CJ14 TY6080 RG4HC TY26723
CJ6 GA10075 RH10C AM37129
CJ7Y AM54611 RH18Y TY6082
CJ8 AM54450 RJ12C AM39011
CJ8 TY6123 RJ17LM AM37145
CJ8Y TY26708 RJ19LM TY26715
CJ8Y TY6079 RJ19LM TY6129
D14 AA4053R RJ8C AM37246
D16 AA4369R RL4J TY26710
D21 TY6040 RL86C No Longer Available
D23 AA5593R RL95YC TY6122
D9 AR26544 RN11YC M802138
F121501 TY4589 RN11YC4 TY21719
H10C AM514T RN14MC5 TY26704
H12A No Longer Available RN16Y M805853
J12YC TY6039 RN2C TY26717
J8 AP19170 RN3C TY26716
L15Y ET12355 RN4C PT21132
L86C AM37234 RN57YCC TY26720
N11YC AT21343 RN5C GA11342
N12YC AM36791 RN9YC MG508171
N5C AT21177 RS14YC AM132420
RA6Y TY26721 RV12C AH80481
RA8Y TY26722 RV12YC AE38392
RBL11Y AE38392 RV15YC4 AM38027
RC12YC M78543 RZ7C TY26707
RC12YC TY26709 UD16 No Longer Available
RC12YC-CS1 M143270 W14 AL2005T
RC14YC TY26709 W18 AC600R
RCJ6Y TY26705 Z9Y TY26711
RCJ7Y TY6062
Champion: John Deere: Champion: John Deere:
A25B 508R RCJ8 M71939
A6 TY26724 RCJ8Y TY6081
CJ14 AM101194 RD16 GA11417
CJ14 TY6080 RG4HC TY26723
CJ6 GA10075 RH10C AM37129
CJ7Y AM54611 RH18Y TY6082
CJ8 AM54450 RJ12C AM39011
CJ8 TY6123 RJ17LM AM37145
CJ8Y TY26708 RJ19LM TY26715
CJ8Y TY6079 RJ19LM TY6129
D14 AA4053R RJ8C AM37246
D16 AA4369R RL4J TY26710
D21 TY6040 RL86C No Longer Available
D23 AA5593R RL95YC TY6122
D9 AR26544 RN11YC M802138
F121501 TY4589 RN11YC4 TY21719
H10C AM514T RN14MC5 TY26704
H12A No Longer Available RN16Y M805853
J12YC TY6039 RN2C TY26717
J8 AP19170 RN3C TY26716
L15Y ET12355 RN4C PT21132
L86C AM37234 RN57YCC TY26720
N11YC AT21343 RN5C GA11342
N12YC AM36791 RN9YC MG508171
N5C AT21177 RS14YC AM132420
RA6Y TY26721 RV12C AH80481
RA8Y TY26722 RV12YC AE38392
RBL11Y AE38392 RV15YC4 AM38027
RC12YC M78543 RZ7C TY26707
RC12YC TY26709 UD16 No Longer Available
RC12YC-CS1 M143270 W14 AL2005T
RC14YC TY26709 W18 AC600R
RCJ6Y TY26705 Z9Y TY26711
RCJ7Y TY6062