Importtant Note: Depending on different make year and serial number, JD designed different sizes deck wheel arms even on same model, such as 3/4” 7/8” and 1” shaft arms. AND THIS ARM SET MEASURES 7/8” DIAMETER. Please measure your original wheel arm size and check your model serial number for fitment before purchasing, or you may get wrong replacement arm for your tractor Item Part number: AM120680/AM120681 Arm Diameter: 7/8" Arm Hole: 0.345" Used Location: AM120680 used on only Right Hand Front of the Deck AM120681 used on Left Hand Front or Right Hand Rear of the Deck Fitment List: Fit for 2210 2305 with 54C & 62C Decks Serial #s above 040000 Fit for GX335 GX345 GX355 with Serial #s below 090001 Fit for X465 X475 X485 X495 with 54C Decks Serial #s above 040000 Fit for X500 X520 X534 X540 with Serial #s below 020001 Fit for X575 X585 X595 X700 X720 X724 X728 X729 X740 X744 X748 X749 with 54C Decks Serial #s above 040000 Fit for LX280 with 54C Decks (Serial #s between 050001-090000) Fit for X320 X324 with 48C Decks with rotatable gage wheels (Serial #s below 040001) Fit for X340 with 54C Decks (Serial #s below 045000) Before You Buy: First, measure your original arm: it must have a 7/8" diameter and a 0.345" arm hole, otherwise this part will not fit. Second, verify both your mower’s model and serial number. A correct model alone does not guarantee compatibility—your serial number must also be within the listed range. If you are not sure, contact us before ordering and we’ll confirm fitment for you.