re-doing interior

[rclare454]

I purchased a 71 SS last year, and not recieving any paper work detailing the cars restoration, I'm at a loss to know what is "orginal", and what was just put in the car to make it look orginal, and look good. I'm getting ready to replace the carpet, and while in the process, I'm looking at replacing the seat belts. The orginal color for the interior was blue, but has been changed over to black. The seat belts were (dyed black), but the blue color is showing thru, and I would like to replace them with orginal equipment belts. My question is, do the orginal belts have aluminum clasps with GM logo in the center (push button) or are they black plastic? While looking on e-bay, I have seen several that claim to be 68-72, but they look different then what I have, and now I'm confused as to what is right. Is there a certain belt that is right for a 71? Any information would be greatly appreciated. Thanks Rick