Contact Steve Pekrul at seatbeltplanet.com at Steve Pekrul (877)435-6363. They sell 2 piece belts that are FMVSS 209 compliant. They can custom make you a set but it will probably take more than 30 days. I saw these generic ones with snap-in ends that might work for you:
https://www.seatbeltplanet.com/seatb...ucts/23/view/5 I dealt with Steve in getting a set of 3 point belts for my Healey. He was really very helpful and his name is pretty well known on the classic car forums. My belts don't have a label sewn in to show DOT compatibility, but maybe they can provide you with a certification. The prices are about $50 the pair and will at least get you through inspection.