Dennis,
I think if you go by the sequetial VIN numbers up to the start of the GT5S cars it could be as many as 300. However, not all the cars in that run were GT5's, similarly theer were a few GT5's produced after the start of the GT5S cars production e.g. Peter Havlik's '89 GT5. In fact he probably has a better estimate than anyone of the GT5 numbers produced as he has an extensive library of information on the post '78 cars.
Julian
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