I've seen a few guys mount the thin spokes on C4's. They will bolt right up but sit inboard quite a bit from the normal C4 setup. Some use spacers to get a more correct looking offset, or just run them as is.
I just mounted some 2000 z06 wheels to my 1995. I read this forum all through and everywhere it seems to say -you will need spacers, or , they will sit too far inboard if you don't! My sawblades were 17" and now I have 18" rears and you know what? They DON'T require even the slightest of spacers, shims , washers ,whatever! Fit good, Look Better!! Throw your thin spokes on and they'll most likely fit like a glove. Good Luck!:cheers: