Recaros were used in some Trans Ams from 1981 to 1986.
Standard on the 1981 NASCAR Edition Turbo Trans Am, and the 1982-1984 Recaro Trans Ams. Optional from 1985-1986.
Pretty much any Recaro will work in your car. So, just look up Recaro seat on ebay, or just Recaro. Check out junk yards too, as alot of VWs and BMWs had them too. You can get them really cheap at the yards. Heck, some people even find them for free! Right Alex?
Recaro also sold their own brackets, which were really solid, but I have been able to use the stock brackets on my one car.
Hope this helps,
George