BILLET REAR BEARING PLATE GMC 6-71 These rear bearing plates are CNC machined from 6061 T-6 aluminum. These rear bearing plates are polished and use the standard .308″ dowel pin. They are non-symmetrical and designed to work with standard GMC 6-71 style cases. These plates include grease covers, O-rings, .308: pins and S.S. mounting hardware. Note: Bearings and Seals not included.