Thought I would post some of what I have found while looking for seats for my car.
I was looking for something more supportive but not full on race, since my car is going to me mostly street.
I was conisdering the Corbeau TRS and CR1. The TRS was more comforatble to sit in and about 20" wide. The stock Pantera seats are about 19" wide.
I took measurements and built a little mockup to test in the car and boy they did not fir all that well, but they might have been able to work.
I then looked at Sparco's R100 and R505. They both look like nice seats, but not the lightest out there. Best of all they have a width of 19.6" and 19.2". These look to be a pretty good fit. My problem is that there are no shops or anything in my area (maybe Chicago or somewhere in NJ according to a distributor) to actually try out the fit of them and I am not going to buy them.
For now I found a set of Fiero seats that I am buying and going to use these for the planning stages. Not much of an investment if I choose to re-sell for something else. I will hold off on Mr Mikes skins until I am ready.