Spool, 7", for 1-1/4" Axle and Models with 11" Spacing .Fits JD 310, 315, 330, 331, 335, 340, 350, 355, 360, 375, 640, 650, 670 discs. 637 disc with C spring bearing hanger. 510 and 512 disc rippers. 1700 mulch tiller. Replaces OEM# B34212, N241234