You can't run a 1" or a 1.5" adapter that has the hubcentric ring on it for your new wheels. If the adapters they're running are hubcentric at all, it is only to the hub on the brake rotor not the new wheels. Take your caliper and measure the height of the hub. If you want adapters for the Camaro wheels with the hubcentic ring for the wheels, the adapter will have to be taller than the hub.
Well mystery solved on that front then. I went back through the whole thread and no one had mentioned whether they were or weren't running hubcentric. I just assumed.
Conehead396 has a point then, if they're not hubcentric on the rim, the rotor snout still might be bigger than the hubcentric area of the wheel. I measured the hub bearing area on my rotor at 67.6mm and the Camaro wheel bore is listed at 66.9mm. I cant get the calipers down in there to measure it. The rotor snout might be slightly smaller depending on who manufactured the rotors. There's probably no reason they couldn't be shaved down a bit on a lathe and make them hubcentric LOL.
If I have that lip turned off I'll have to measure how much room I've got on the wheel and can probably forget about centercaps.
Choppin' Block/CBCpro chassis is supposedly coming out with a modular spindle for OBS trucks that uses a unit bearing type hub and is supposed to come in 5x5 pattern, but I have not heard anything new on it in a few months. If it keeps the same OBS wheel bore I could use it on those maybe.