Hi, Ben. The ball bearings used are simple single row types, available almost anywhere such as Bearing Specialties on DelaCruz Ave in SAn Jose. Take your old ones in for a comparison. I also suggest you buy a copy of the 'Pantera Service Highlights, from an yoy of the vendors, or from POCA. It details the whole rebuid process, including re-shimming the pinion assembly when you change bearings. Thats why I advise NOT changing bearings unless the balls are severely worn, as its possible to back yourself into a corner in this reassembly: there are no extra shims available so if a new bearing requires one that you don't already have, you are then forced to have one made, maybe from a surface-ground valve spring shim or similar source.