Arizen racing seats?

Anybody tried any of these?

http://www.arizenracingsports.com/page/arizen/CTGY/Seats

I've been leaning towards the Procar Elites, but I'd like something that has slots for harnesses after I (eventually) put a roll bar in. The Arizen seats look nice, but I haven't found many people using them thus far.

Are there any organizations with safety standards for seats to meet? SFI? I don't want to bet my life on a piece of crap.

My driver's seat frame is severely bent, so I have to buy something RSN for safety's sake.

thanks!

FYI, as a follow-up to this, I talked to Arizen and they said:

"We do not recommend the seats for Mustangs in the 60's or early 70's. The seats would likely sit too high in the front unless the floor was modified. We have shops that have installed them such as below but they did modify the floor."

Apparently themustangshop.com has installed them that way.