My car has a 4/90 build date and had the armrest delete (which I just sold) My emblem has the 25 years on the bottom.
I am pretty sure my 91 had a pony logo on the dash, but IIRC it had no 25 years on the bottom, that was a reeeel late 91 I found a 8-13-91 date on the oil filter ( yes I bought that pony new, but it was stolen twice)