Toplink Ball F2681R Fits CAT.II fits J D 520 530 620 630 720 730 2510 3010 4010One New Aftermarket Replacement Ball that Fits John Deere Tractor Models 1020, 1520, 1530, 2010, 2020, 2030, 2040, 2240, 2355, 2440, 2510, 2520, 2555, 2630, 2640, 2755, 2840, 2855, 2940, 2955, 3010, 3020, 3055, 3155, 3255, 4000, 4010, 4020, 4030, 4040, 4050, 4055, 4230, 4240, 4250, 4255, 4320, 4430, 4440, 4450, 4455, 520, 530, 620, 630, 720, 730. Also fits White Oliver Mpl Moline Tractor Models 1750, 1800, 1850, 1900, 1950, 1950T. Tech Info: Hole 1"