[gtoric]

Coach,
Don't know if you still need help here, but I'll check in with some opinions.
1) The 8-lig trim rings were specific to that wheel. Repop trim rings were available for awhile. Don't know the application or the current availability. Check PY to see what they might still carry. Center caps are strictly a used-market item. Ebay, Smoke Signals, Hemmings, or swap meets.
2) I restored a '67 GP convert several years ago and during the process restored a set of 8-lugs. I bead blasted the hubs, painted the entire center section face a high temp black. Then, with a hand drill, I polished the flats of the fins with a 6" diameter 120 grit stick-it paper on a sanding pad. The rims were refinished in black.