Good evening Jonathan
So, original GR4 factory cars wheels were 1. in magnesium, and 2. Rear size was in 14" ( I have even been told some 15x15 were produced, but I never saw any ) , while GT5 and GT5S have the same design , but rear is only in 13".Fronts are all 10".
I have a full original Campagnolo factory GR4 set set that you can copy.
We just need to go into details , but there is a significant market for those , much much more than for Mangustas.
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