Could be wrong but if you have original seats( bench) you could use original belts with just the roll bar-side bar, not cage.? Thought I read that somewhere about stockers. Of course every track interprets the rules differently. They all want you on the money train, seat belts, ok, two years, stupid money grab. F117a uses same belts till retired, but of course they don't see the G forces of a 11 second race car.