wheel cap size

Are the center caps on the factory wheels a standard size? When I got my SL the protective plastic on my wheel caps had never been removed and it had dried and cracked and doesn't look great. I have tried removing it without much luck. I was thinking I might just get replacement caps and I know that Slingmods sells them, but I was thinking if they are some standard size I might have more options.

Thanks

Quote from slingmods

All factory rims from polaris have a 3" center cap! They only difference between them now is thickness in paint and clear coating

thank you very much