These Steeda Driveshaft Spacers Eliminate the need to have Custom Shafts made for Length Deficiencies of 3/8" to 11/16". They Greatly Reduce the chance of Slip yoke Failure by Maintaining Proper Engagement. These Parts were Developed by Steeda Hardcore for the Renegade Mustang to fit a C4 Transmission. Steeda Manufactures these Spacers from Billet Aluminum for a Lower Rotational Mass and they are Anodized for a Long-lasting Finish. The Kits include Grade 10.9 Hardware and are Laser-engraved with the Steeda Logo to Ensure High Quality.