Sunbelt Drive Pulley - B1GD55,1 Fits our B1GR5 spindle assembly. Dim A (1) Short hub Dim B (2) 12 splined OD 5-3/4" ID 7/8" Splined Height 3/4" Inside Diameter: 7/8" Splined Outside Diameter 5-3/4" Mega-Cross: Crossed From: D18083 GREAT DANE 10161 ROTARY Associated Items: Item Number Description Qty A-B1GR5 Assembly, Spindle Sections and Models: Sunbelt - Pulleys Drive Pulleys Great Dane (Undefined): SEVERAL

This is an aftermarket product, not an OEM.
Thanks for looking!