T, with the amount of cash you already sunk into the ride, why go for Corbeau, or even RX-8 seats? Stop being stingy and go for some RECARO or BRIDE seats. I sat is some, and the reclinable models like the GIAS seat are amazing. They are hella comfy yet support you just as well as a full bucket.
A guy was talking about using a corbeau, and having massive back problems because he drives his car so much. Other people told him that they had the same problem with the same seat, and it all went away after they changed to a sparco or the like. He tried it, and poof, no more back pain!
From anything I've searched on about seats, it seems that the reason for the Corbeau being so "Cheap" is not necessarily that they are "bad" but that a lot less time goes into the design of ergonomics on them, resulting in uncomfortable seats. Sure, with proper brackets, they may be good enough for a 1hr stint at the track, but try to find one endurance driver who runs corbeau seats... they all go for cobras(at least) recaro, sparco, momo, or one of the other top brands.
My buddy also has a pair of Corbeau reclinables in his 944 Porsche. They sit alright, but my ass was sore as hell after we spent the whole day doing a road rally....