bbs rims - advice

[02cab]

Hi

was going to go with 944 brakes and porsche turbos on my gl cab but dont think my budgets gonna stretch at the mo so looked at bbs etc on ebay,some of the split rims are really nice although not sure what would fit on a 1302ls

what stud patterns do they come in? i see porsche fitment and bmw etc

im looking for 17 or 18" 7-7.5" with et 40 - 55 is this correct?

what about ease of fitment

thanks for help