I plan on fitting big blacks on the front of my car with either 993RS one piece or 993turbo two piece discs, both 322x32 and 72mm offset as I understand it. Obviously I will need to fabricate some axial to radial adapters, but does anyone know the dimensions?

 

Why not just get the Rennline adapters? For $200, you get a nice aluminum adapter with the necessary bolts and spring washers.