Disc, Clutch Assembly (S/N B201000 > ). PART NO: A-RE29878. Replaces AB3471R, B2355R Dim A (1)I.D.: 4.125" Dim B (2)O.D.: 9.624" (Includes Tangs) Dim C (3)O.D.: 7.000" (W/O Tangs) Dim D (4)Thickness: .432" Dim E (5)Tang Width: 2.000" Dim F (6)# Tangs: 3. . MODELS: John Deere TRACTOR: B (S/N B201000 > ).