21" rear bagger. Fits models 312R, 313R, 315R. Replaces OEM #: 742-0621, 942-0621, 742-0521 Length: 20-15/16" CenterHoleDia: 13/16" OutsideHoleDia: 3/8" CenterToCenter: 2-1/2" width: 2" Thick: .150"