John Deere Original Equipment Spark Plug - M805853
This fits John Deere Riding mower models: 1420, 2500, 2500A, 2500B, 2500E, 2653, 325, 335, 345, 425, 445, 455, 636M, 647, 647A, 648M, 648R, 652B, 652E, 652M, 652R, 657, 657A, 661R, 667, 667A, F912, F932, FGT245, GX255, GX335, S240, X300, X304, X305, X310, X320, X324, X340, X350R, X354, X360, X370, X380, X384, X394, XX465, X500, X520, X530, X534, X540, X570, X580, X584 and X590.
Ztrak models: 717, 717A, 727, 727A, 737, 757, 797, Z445, Z465, Z540M, Z540R, Z645, Z655, Z810A, Z820A, Z830A, Z840A, Z850A, Z910A, Z920A, Z920M, Z920RZ925A, Z930A, Z930M, Z930R, Z90A, Z950M and Z950R.
Walk behind mower models: WG32A, WG36A, WG48A, WH36A, WH48A, WH52A, WH61A, WHP36A, WHP48A, WHP52A and WHP61A.
Gator models: 2020, 2030, 2020A and 2030A. 
This is a genuine John Deere part.