Hi,

My 1993 Corse I began with 7 x 15 Front and 8 x 15 Rear and now uses 7 x 16 and 8 x 16 (ex Arthur/Turbonutter), kept the 15 inch ones for track days tyres.
The rears have zero offset and the fronts have 35 mm offset plus a 6 mm spacer.

The build manual from the early 1990's recommended 7 x 15 and 8 x 15 with zero offset rear and 40 mm offset front.

rgds Bob