here is a set of black
NOS shoulder belts on eBay right now. They are for a truck, they are GM, but they appear to be Newer GM brand NOS. You can tell by the 5-band webbing and the non dimpled male buckle retaining boots. Also, the retaining boots may be a bit longer than the 1967-70 or the 1971-mid 70s. I can't quite tell, but it looks like it. Nevertheless, they are a nice find, for someone wanting to add this rare option to their ride. I thought I'd let some of you know incase someone's looking.