I have a 1991 Mustang, it's a former FHP car that had def seen better days when I got it. I do know that it was plate # FHP-631. This was in some of the paperwork that corresponds with the Vin#.
Would love to see some pics if anyone were to have any.
Here is a pic of it now. I kinda wish I had restored it but at the time I got my hands on it I had other intentions on my mind. Built a nice clean street driver out of it, car is complete now, right down to working a/c and heat.