Coop, I don't know about the replacement covers from Banzai, but I have the kit from MSA installed in my '70. I'm very satisfied with the quality and fit of these covers, but they're not for someone looking to put together a 100 point restoration. The "grain" pattern of the vinyl is obviously different from OEM, and as Enno has pointed out, there are fitment differences as well. I also think Banzai would be a good place to start looking. They have the proper seat foams too, if you need them. Good luck on your resto!
Roadman
Gulfport, MS