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
Bosch: John Deere: FR8DC TY26709 H6DC AM132420 USR7AC TY26706 USR7AC TY26713 W8LCR TY26704 WR10A TY6126 WR3CC TY26717 WR4CC TY26716 WR5A TY26710 WR8DC M802138 WS7F TY26705 WS8E AM54450 WS8E M71939 X4CS TY26724 XR7LDC TY26722
Autolite: John Deere: 64 TY21719 64 TY26704 65 M802138 67 M805853 103 AM132420 245 M71939 245 TY6129 258 AM101194 402 TY26716 517 ET12355 2755 TY26724 2976 TY26705 3684 TY26710 3702 TY26717 3924 M78543 3924 TY26709 4194 TY26711
AC: John Deere: R44T AH80481 R43T AH84603 Denso: John Deere: W20ETR-S MG508171 W20FS-U AM37234 W20MP-U TY6079 W20MR-U TY6129 W20M-U AM54450 W22MP-U AM54611
NGK: John Deere: B6HS AM37234 BKR5E TY26709 BM6A AM54450 BM6A TY6123 BMR2A-10 AM122402 BMR4A AM101194 BMR6A M71939 BMR6A TY6129 BP4HS ET12355 BPM7A AM54611 BPM8Y TY26708 BPMR6A M77742 BPMR7A TY26705 BPR4ES M805853 BPR4HS TY6122 BPR5EFS AM132420 BPR5ES M802138 BPR9ES TY26720 BR2LM TY26715 BR4HS TY6126 BR7HS TY26710 BR8ES TY26716 BR9ES TY26717 BR9ES (SOLID) TY26718 BR9EYA TY26719 CMR4H TY26706 CMR5H TY26713 CMR6H TY26707 CMR7A TY26712 CMR7H TY26714 CR5HSB TY26711 CR9E TY26723 D8EA TY26724 DPR7EA-9 TY26722 DPR8EA-9 TY26721 TR5 AM132420 ZGR5A TY26704
