In the '70s and '80s I read a lot of VW mags, like VW and European Cars....before it became just European Cars, and I don't recall ever hearing of/seeing a "factory" Trans AM package. I suppose it's possible there was one and I never heard of it, but most German car manufacturers included a set of Recaro front seats on their special editions...even (German-built) Fords.
About a year ago I (stupidly?) passed on buying a 'Rocco of near the same vintage. It was stock, lowish miles and had a sunroof, I think. The guy was driving it off and on, so it wasn't just pulled out of long term storage. His asking price? About 1/4th the price for this car. I didn't buy it because I thought it might not have enough headroom for me to drive. Yes, I'm still kicking myself, and still watching Craigs to see if it comes up again.