I found a set of the older Italian-made Carrera Light replicas this Spring and the rears were 18" x 10" with a 47 offset. They fit perfectly with no spacers, so I guess this means you need a minimum of an 18mm spacer. You will likely need to tie back the E-brake cable to keep it from contacting the rim. Many people have used heavy duty zip locks, or Porsche has clips you can buy.
Good luck!
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