The UMI P/N 3046 brake conversion bracket is designed to mount 1997-2013 C5 or C6 front calipers and rotors to the 1978-1988 GM G-Body factory spindle. Conversion brackets are CNC laser cut from 3/8†thick mild steel and feature a heavy duty black powder coat finish. Each kit includes Grade 10.9 mounting hardware and complete detailed installation instructions. Supplied installation instructions included detailed list of GM part numbers needed to complete the brake grade upgrade. 17†wheels needed for C5 brakes and 18†wheels for C6. As with all UMI Performance products, these brackets are 100% manufactured, tested and raced out of Philipsburg, PA – USA.