Ok, I am going to try this again

I won an auction for a set of BBS Sport Classic II Wheels Rims 18in OEM (7.5 x 18 ET50) & (10 x 18 ET65). The fronts will be fine without a spacer but the rears are going to need around a 20mm spacer, correct? Anyone have this set up? And any opinions on where to get my spacers? ie, good quality at a reasonable price?
I will probably stick to my original plan of putting the Pilot Super Sports on but I don't know the condition of the tires that are on there right now. I hope to pick them up over the weekend. Hopefully these will be true this time!