Corbeau clubsport subframe

So after being told the seats would fit without subframes.... after faffing with a rounded seat rail bolt I finally found out that you do need a subframe.... can anyone recommend me some subframes for these seats
 
Who told you that they can be bolted without any subframes?
Only 1 car I've ever seen / worked on that sliders bolt straight up to, were on a Porsche 964!

There is sparco or OMP, it is a split opinion as some hate the OMPs, others love it.

Do a search on here, I think it was the OMPs that are not preferred (something about being way too low rings a bell).