I have a 1980 Sedan DeVille with the original 15 in steel wheels. I would like to upgrade to some newer cadillac wheels; maybe 17s. I don't know what to look for. What offset, bolt pattern size, etc. will work on my car?

5x114.3 IIRC

I think aynthing from a RWD caddy will work, as well as other imports (Infiniti, lexus, etc)

The FWD caddy rims may have too much offset.....