I'm using an 18x10 ET 47 rear wheel which is close to your ET 52 (5mm). I'm using a hybrid 930/944T rear setup on stock beetle trailing arms which pushes out my rear hub by 23mm, same as the 86 Turbo arms. You'll need a 15mm spacer ... check this thread ...
http://www.germanlook.com/Forums/sho...ight=930+rotor
I see you have a Super ... you will need a wider fender than the 2" I beleive to fit that 8.5" front wheel ... may need to increase the size of the rear to match then ?
Sandeep