Procar Bucket seats in an early Mustang! How-to and review! 

I've only got a few miles on them so far, but they are comfortable, mainly due the adjustability, for me anyway.

I haven't installed carpet yet, I was going to simply mount them over the top of the carpet, will help keep the carpet down and away from the tracks. If you put them in before the carpet, you'd have to cut 4 holes for the round mounting tubes to poke out on either end. It may bunch up the carpet. It would make it difficult to mount the seat as well. I'd suggest mounting everything above the carpet.