USA Standard axle for 1999-2004 Mustang, 31 spline, 5 lug, 30.75 long All USA Standard axles come with a limited 5 year warranty Put the power of performance in your vehicle in both front and rear applications Proven manufacturing technologies provide top quality products Features and Benefits: All USA Standard axles come with a limited 5 year warranty Put the power of performance in your vehicle in both front and rear applications Proven manufacturing technologies provide top quality products Details: AAP UDA 4: 50 Axle Nut Included: No Retainer Included: no Shaft Length: 30.75 inch Wheel Bolt Pattern Size: 5 x 4.5 inch Application Summary: 1999-2004 Ford Mustang (Rear) (Drive: Rwd / Note: Ford 8.8 inch. 31 Spline 30-3/4 inch. Length 5 Lug Single Shaft)