Description:Part # 6M-4928 provides a duo cone seal retainer for the elevator chain idler on the 633/633B/633D/633E/639D Wheel Tractor-Scraper.Attributes:• Retainer with dowel pins• Outside Diameter: 142.75 mm (5.62 in)• Inside Diameter: 76.33 mm (3.00 in)• Width: 26.92 mm (1.06 in)Application:Consult your owner's manual or contact you local Cat Dealer for more information.