Where would i be able to find black seat belts for a 78 El Camino with the 50/50 split bench? Would these seat belts work for my application? Black Bucket Seat Belts (https://www.opgi.com/product.asp?ProdCode=463230B&topcatid=124&grpcode=26088&yearrange=&chapterid=423)

I'm looking to find some myself... I have an '86.

Those belts are for older cars pr 1971. They are only 2 points seat belts.
Legal in old cars, illegal in newer.