Your pics are not very clear, but understandably so w/the seats in place. I just found some older threads of yours w/clear shots (sans seats). Since I'm 6'3 I anticipate the seats being most of the way back, so this location should be ok. Will commence drilling tomorrow...

 

Ok, tunnel eye bolts w/backing plates are in. Waiting on the 3 bar slides from HMS to change out the clips (will "wrap" the sub strap around the GT3 sub bar).
I have a Sparco Pro Adv (picking up this weekend from a fellow Rennlister) & a Sparco pro 2000 for the passenger seat. What mounting brackets work w/these seats ? My search seems to point towards either Recaro or VAC (universal)...thoughts ? Steel or aluminum ?
The idea is to mount directly for max headroom (no sliders).