Correct Super Stock Seats?

The super stock seat looks like a100 van seats but is not the same. The super stock seat is lighter and smaller. My friend has a BO29 car. His car only had the original driver seat. So he found a A100 seat that looked the same. When he measured them and took them apart all different. The seat foam on the SS cars are stamped 999 special order. The frames are also a lot lighter. Yes they fold. But I did find that later ones did not fold. You have to tell Legendary if your seats are original or A100 so the cam make the covers correct.