Ultimate flex is right here. You will need to be quick. This is the OEM Rear Seat Delete as fitted to the Clubsport S. It fits both 2 door and 4 door and it's getting harder to source and more and more expensive. Won't be long until it's VIN locked just like the Clubsport S bar and net - can't get them at all unless you have a CSS VIN.
You need to modify it to fit the seat anchor through it (unless you plan to cut that off and never have back seats again). So some slight cutting required.
Special Order item. Lead time 3-4 weeks for delivery.