Carrier part # 635-6609 for use in the transmission planetary of the TH43-C18 Mobile Hydraulic Power Unit.Attributes:• Cast iron carrier• Internal Spline Number of Teeth: 40• External Spline Number of Teeth: 59• Outside Diameter: 333.3 mm (13.12 in)• Width: 292.1 mm (11.50 in)Application:Consult your owner's manual or contact your local Cat Dealer for more information.