But i think the key is that Mark says that his car has riveted fender flares, which is an indication that it is not a GT5. GT5's have the fiberglass flares attached, um, I'm not really sure how but you can't see rivets! It is a smooth junction with a bead of sealant or something running along the joint. The riveted flares were the GT4/GTS look.
He'd need to check with the previous owners to find out what the story is, but I'm inclined to agree with Franz and others that it began life as a GTS and was converted later.
I also agree that none of this really matters - congratulations on a cool car!
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