All of our new parts are aftermarket replacements. Compatible with John Deere Lawn & Garden(s) X300, X300R, X304, X305R, X310, X320, X324, X330, X340, X350, X350R, X354, X360, X370, X380, X384, X390, X394, X500 (s/n 020001-later), X520 (s/n 020001-later), X530, X570, X580. Replaces John Deere OEM Number(s) AUC13500, AM136044, AM134543, AUC11188. All States Ag Parts Item No.