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I'm not sure, but Seatbelt solutions has original style seatbelts with gm buckles. I spent around 480$ and am waiting for them to come in. Should look nice. Sorry I could not be of more help
The 72 shoulder retractors bolted on top and the 69 bolts to the side of the wheel well. The 69 parts will not work if bolted in the same place as the 72. You will have to drill a hole to mount the 69 parts. The late model Camaro rear seat belts will bolt in where the 72 had them and will work.
If you're looking to use '69 lap belts and '72 shoulder belts together, it's a no-go.
The '69 lap belt design has a hole/slot arrangement in the "D" ring to accept the shoulder belt tab. By '72, the design was reversed, therefore, the lap belt had a button and the shoulder belt had the hole/slot.
If you aren't looking for exact replicas you can use a rear set up from a later 90's Camaro/Firebird. It's bolt up solution but you have newer plastic Gm style buttons instead of metal GM style, much info on the forum if you do a search.