SMS is a great source for the material but beware that not all the materials they have as NOS are the same. For example when I needed a section of the medium saddle tan naugahyde for Gramma's '75 Firebird seat for an abrasion where the seat belt buckle rubbed, they had the exact date coded vinyl but when it arrived it was the canvas backed (non-stretchable) vinyl and not the more elastic vinyl I needed for the repair panel. The material they had was what the factpry made the welting between the panels, with - the vinyl they rolled up a round strip of plastic in.
