Modern seatbelt retrofit - who makes these?

I wouldn't buy anything except for the modern factory type seat belt.....to more specific I always use the Humvee (factory seat belts). I've bought many different after market belts but they are all "clunky" in operation. I want something like the factory that locks (and releases) quickly, smoothly and efficiently when I turn a corner or stop quickly. All the after market belts have return springs that aren't as smooth in operation. Not only that...the after market belts are expensive compared the the FACTORY Humvee belts. I imagine somebody bought a crate (or 2) of these new belts from the government surplus and now sell them cheap on ebay. They are brand new and just as easy to install. Of course this is my own opinion but I have built a few hot rods and have bought numerous after market belts......the Humvee belts worked the best and you can't beat the price. These rear belts are extra long and work great for the 3 point application. Good luck in your search.

https://www.ebay.com/itm/2-ea-Humve...AOSwPe1UKXGl:sc:FedExHomeDelivery!78411!US!-1