I'm looking to get a new sport's drivers seat but it would appear that both the Sparco and OMP subframes don't quite work without additional metalwork. GSM sport seats charge £35 to add brackets to each of the above and I think they might just be mimicking what the tophats do so to that extent I am looking to buy a pair to save most of the cost. Let me know what you have and how much they will be with postage
Many thanks
Many thanks