as far as wheel centers, there is a guy up here doing that with Ford wheels. (5-hole Budd rims). The centers he uses are the ones from widow maker rims, the centers from regular split rims won't work. Not sure if it is the same for our GM wheels or not. I think he is putting them in 22.5 rims though, so if you are going 19.5 it may not matter because the rim is smaller diameter.
