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You can get a decent price if you get it all together in a kit, seat covers, carpet, door panels.. do the door panels and carpet yourself and take the seats to a good local upholstery shop if you dont want to try them yourself. I think I am going to give them a try, I found some good instructions on here.
I have a 74 I recently purchased. I am thinking of trying to have the interior carpet and panels re-dyed as there aren't any tears but don't know if this will be cost effective. I wish "resto" parts were as inexpensive as engine parts.
To do the seats properly will be ~$1,200. I include the pass-through shoulder belts and associated hardware/trim pieces. All attachment screws, bottom frame reinforcement plates, trim parts, adjustment bumpers, seat hold-down bolts, etc.