Driveshaft Spacer Type 6 goes Between Right Bearing & small gear to keep sprocket from walking or rubbing inside of frame. Specs-ID-600/1000ths OD-800/1000ths & is 120/1000ths wide. need for such a spacer to be determined by purchaser by measuring distance between edge of installed gear & right side bearing. not all shafts need such a spacer as some have gear snap ring like Cobra or can be welded. not for use with chain drive kits.