Well, got a solution to my wheel problem.
I had a used 99 C-5. The rpevious owner had an aftermarket chrome job done on OEM wheels. As I have a crack in the RR, I went to the dealer to try to get a replacement. The dealer wanted $639, just for an aluminum one - allegedly GM don't do my wheel in chrome.
Went to Discount Tire & got a chromed OEM wheel for $360. One year warranty on their chrome job. WE'll see how well it holds up. But even if the chrome goes - I got an OEM wheel for barely over half the dealer price :-)