Buffing Wheels - Just make sure you order the right size hole for your arbor. There really isn't a lot to them, PSI did sell a set up like the Beal system not listed anymore. Wasn't much to that one, 3 buffing wheels with big washers and nuts on either side. One end tapered to MT 2, the other has a dimple in it for your tailstock.
Novus Kit - I typically use Novus 2, but do on occasion use Novus 3. Therefore I buy the 3 part kit in 8 oz size. The kit works great for polishing headlights out on your vehicle as well. Novus 1 works great on thin transparent plastics, i.e. soft top windows on the jeep, windows on the pickup topper.