I'm sure this has been addressed many time probably but I'm another "new" GXP owner and not overwhelmingly familiar with these vehicles just yet (Previous GN owner/racer) What size/backspacing/bolt pattern works best with these Poncho's?? I'm considering 18" Valencia wheels from TSW. I'm sure the sales dept could probably help but from my past experience it's always Much better to talk with the actual car owners.. Thanks in advance guys!!!