If it was sold in Europe then it is not called a Mustang. It was a T-5. These were pretty much sold in the German Market. It is a Mustang. The serious collectors will pursue T-5 Mustangs. You can go to MustangMonthly.com and go to the featured vehicles link and they will explain what the differences between a T-5 and a Mustang are.
find on auto report, these are rare but in detroit can be found although they were produced in england too. difference is the tophole of altee in rear. price should range 2000-2700, if required more there is more than one. In ranger there are four too. You cant miss them if go to parlor or channel. Ask for Rog