I chose Andover restraints. I looked over a few sets of Morris, and nice, but in the end I couldn't see much difference. Morris had a few "nicer" more specific brackets, while the Andover had a few more generic brackets (once painted and installed, they look and function fine). $180 for BOTH front seats (plus shipping), and they have a bracket to convert from the single to the double bolt for Chevelle roof mounts (the single stud is larger than the two smaller bolts).
Not only were the Morris belts a little more money, but I wanted matching REAR 3-point belts. Morris doesn't offer those (they said they were planning on offering them, but so far only came out with Camaro rears). I would have originally paid the extra to get Morris's, IF they had the matching rear belts, but I am now completely satisfied with the Andover product.
There are only a few companies (maybe just one?) actually building replacement seatbelts, so there's a good chance its the same manufacturer anyway.
Originally Posted by JackAction
There's never been shoulder belts for the rear seats
I think there were rear shoulder belts offered in 1972? Or at least in other A-bodies, but VERY rare. There was some discussion on here a while back, and there are mounting points on the rear package tray that allegily correspond to the should mounts (even my '70 had these mounting points).