GW211PPB20 Disc Harrow Bearing 2-3/16" Bearing Only from John Deere AA30942 Kit BORE SIZE 2-3/16 " RoundFits 315, 335, 355, 375, 635; 637 with C spring bearing hangers; 640, 650, 670 discs. Also fits 310, 330, 331, 340, 350, 360 and 370 discs updated to Dura-Flex® bearings and flanges.Fits 510 and 512 Disc Ripper.Replaces: AA28186