I spent 20 mins looking it over, the only identification I see is the letter "A". No other p/n or marks. It is aluminum and is 63" at it's widest measurement. Could it be 78-80 or big car? I also looked through my dealer parts book (82-90 Buick B, C, D, E, G, X) none of the illistrations resemble this part. Any guesses? Thank you for your help!