Question: Seat Covers- Replace Standard with Z06 or C6 Covers?

[AutoClassic]

I have a 1999 C5 with standard seats and would like to re-skin them with either Z06 skins (leather seat covers) or C6 standard skins. Anyone done that? Can it be done or do you have to change out the entire seat frame? Lots of great stuff on the forum related to replacement of seat covers, but a quick search did not come up with anything on switching skins. Anyone?