Thank You, and there it is indeed on the buildsheet "T93 BLK TAIL LAMP" for our '78.
For more conversation as to W72 / Auto availability and build dates in 1978 Trans Am Y88s here's a source for review:
http://nyghtwyngs.com/fileup/uploads...alsW72File.pdf
Although not conclusive as to actual W72 Y88 dates and build numbers, it is a source that adds to the topic and for discussion.
