Capturing a piece of early 70s Trans Am mojo...what can be done?

How do you like those seats? What brand and model?

I have Procar Elite seats and they don't hold me in very good at track. I don't think the smooth vinyl helps either.
The seats are "Cobra Classic RS Forty" ordered through HMS Motorsports. They work approximately as well as I had hoped. Very sports car-like. The side bolstering is VASTLY better than a stock style seat and they hold you in well but not at true race car levels. I haven't tried the Procar Elite but based on the looks, I don't believe the Cobras would be better at the track.

The biggest benefit of the seat swap was the 30-40lbs that they save compared to the bench.