An interesting set of rims

I spotted these rims for sale on an online classified ad site last night. They came off a Chevy Caprice but I’m not certain what year and the seller makes no mention of the bolt pattern. I’ve got a little research to do to find out what these are and see how they look on my wagon, but at first glance, I sort of like them. I think the blue areas could be nicely restored in a colour that would blend well with my wagon and could be really sharp.