Hello,I have a 66 c30 that had the lock ring wheels. They were in bad shape(rusted,bent)so replaced them with 16"rims from an early 80's 1 ton No problems fit just fine. I did drill the hubs and replace the 1\2 studs with 9/16 but the lugs will still stay tight if you don't. Also I run 215/85/R16 radials on it Hope this helps.....Mike