4" Spool, for 1-1/8" Axle, Round Hole (new style) - for models 132, 350, 370, 470, 475, 485, 490, 496, 3600 & 3900 RMX340 Case IH disc with 7-1/2" & 9” Spacing. Replaces OEM# 101191C1, Bearing surface is machined