I did my front Challenger buckets a while back using a Legendary kit and it worked well, but took me around 8 hours per seat to do. There was an article in Mopar Muscle or Mopar Action in the late 90's on this very subject that was really helpful if you have a stash of old car mags you should look for it.
I do remember that for the bottom especially, you needed to be careful pulling the cover in to place to avoid ripping it.
My old foam was in good shape other than an area where a mouse had chewed up. I reused my foam but had bought some foam squares and made up a section to replace the damaged area, and glued it in place.
The hog rings can be a pain to remove and to get in place when installing the new cover, when doing a seat with a lot of contours like an ebody bucket. Buy a couple of good wire cutters from a company with a liberal warranty return policy like Craftsman or Klein, as you are almost guaranteed to break a pair or two during your cutting of all the old hog rings and the ones you don't get in the proper place with the new cover when installing (which will happen).
Don't worry too much if there are some small wrinkles or creases in the vinyl after you are done. Usually after the the seats sit in the sun for a while small imperfections will go away, at least thats what happened with my seats.
A friend helped me with my first seat, who had done a early 70's Monte Carlo seat before and said this job was easy. He changed his mind about the ease of this job with my Challenger seat! I later redid the seats for a Piper airplane using an Airtex kit and they were pretty easy. Unfortunately E body buckets seem to be some of the hardest seats to do.
I am really happy with the results, my seats look great!
However my other Challengers front seats could use new covers too, and I haven't gotten too ambitious about tackling them yet.
