John Deere Original Equipment Mower Deck Arm AM120680 Diameter measures 7/8". (Fits certain serial numbers of model 54C and 62C.) Fits the following John Deere models: GX255, GX335 (050001-), GX345 (050001-), GX355 (050001-), LX280, X320, X324, X340, X500, X520, X534, X540, X744 (040001-090000), X748 (040001-090000), X724 (040001-090000), X728 (040001-090000), X465 (040001-090000), X575 (040001-090000), X700 (040001-090000), X720 (040001-090000), X595 (040001-090000), X495 (040001-090000), X485 (040001-090000), X585 (040001-090000), X740 (040001-090000), X475 (040001-090000), X749 (040001-090000), X729 (040001-090000).
This is a OEM John Deere part. Thanks for looking!