Quick update for anyone wondering about these seats
I have a 1983 280ZX and I threw in some corbeau GTS II seats with shaved bases and a corbeau dual locking slider on the driverside and a single locking slider, on the passenger side. and corbeau bolt in seat brackets. I'm 6 foot tall but have a 30" inseam so you can imagine my torso is a bit taller than normal. Anyways they sat higher than stock and I ran out of head room and had to drive kind of slouched with the T-Top sunshade removed.
To fix the passenger side I removed the sliding rail and bolted the bracket straight to the seat, reinstalled and I now have plenty of room, even with the sunshade installed. I will be doing to the same to the driverside. But removing the slider makes it difficult to install the rear-outer bolt but its doable especially if you have small arms. Other than that, great seats that work with with my 2" 4pt harnesses.