From Hoghead's:
The car also had no t-tops. This is kind of off the subject, but there is no evidence of any Y88's without t-tops. If you think you have one, it could be worth a fortune, and you should get the documentation immediately. Also, here's a trivia item: All gold 1978 Trans Ams used the big 5-color hood bird that was designed for the Gold Special Edition.
Unless it's a hidden gem........No one has been able to prove a Y88 without T-tops exists. There have been claims that they have a Y88 hard top but after getting PHS documents....they found out differently.
And all Y88's have the fisher t-tops.