Drive Shaft Spacer Type 3 Custom For Lower Left 5m Belt Shaft Sprocket when using 2 left side shaft bearings only! Some models/frames only benefit from extra left side bearing when primary bearing fails or shaft is worn where bearing rides.most models can carry 2 left bearings. call if need be. Fits many scooters if driveshaft bearing dwell in frame is exact same size for entire bore & is for custom improved application or temp fix only! not stock! This spacer goes outside or between lower left side drive shaft bearings x 2! If between two left bearings on Cobra you may need a washer or change pulley to our solid metal lower left pulley. This is for custom application only. Call before ordering! This spacer is only used when installing 2 left side bearings for which some frames don't retain the 2nd left side bearing. Call and we will explain. (256)468-2761 This is an improved spacer that is made in usa. Specs:ID-480/1000ths, OD-750/1000ths, 340-350 thousandths long.