ST. [Model 41,62], [Model 42,61], 1-1/8" I.D., 52119522, 52119522AC, 52854216AA, 52854217AA, Governor Weight, Outer, 1.274" O.D., Inner, 1-1/8" I.D., Inner, 1-18`` I.D., Primary Piston, w/(BGJ), w/BGJ, w/o (BGJ), w/oBGJ, With [Pwr Disc/Drum Rr Anti-Lock Brakes], Without [Pwr Disc/Drum Rr Anti-Lock Brakes].