About The 1997 Mustang
The 1997 Mustang was almost exactly like the 1996 model. In fact, many critics believe that Mustang design and upgrades simply became stagnant after the 1996 model year, though it was the tail end of what many others believe was the single best generation of Mustangs. Of course, there were some small changes and even a new color offering, but generally the Mustang was unchanged from 1996 to 1997. Ford probably figured that they had a good thing going, why change it for 1997, and consumers tended to agree according to sales records.
Source: Mustang Forums