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Okay, Mystery Solved. I remembered another place to lOOOk and I found the answer.
I was WRONG !! I made an ERROR !! I beg the court for forgiveness !! Please, do not vote to ban me, this was my first error, I beg for forgiveness! Search your collective hearts and find a way.......
Here's the answer. The thing I am talking about is called "Driver Alert Lights" (Ford's terminology). ALL 1987s, 1988s & 1989s have them because they were STANDARD EQUIPMENT !!!!
However..... They became STANDARD EQUIPMENT ONLY ON THE GT for 1990. therefore, since all of our asc/McLaren Mustangs were based upon LX 2- Door Sedans....the ONLY ones without this feature are in fact the 1990s ! Okay? Redemption ??????