Can you post any pictures?
The '89 Turbo Trans Ams were all white, with tan interiors. Most had T-Tops, some did not. Most had leather seats, some did not. They all have a motor and trans that is the same as the 1986/1987 cars, save for different heads and headers to fit better in the narrow engine bay.
You mentioned Recaro (I believe) seats. I think earlier years might have had those as an option. See
http://www.transamworld.com/fbird-history-php3.php