Here's a link to jaekeem's F10 with BBS LM-R 20x8.5 ET32 + 20x9.5 ET35.
He's tried both 13mm(F) + 5mm(R) and 18mm(F) + 10mm(R) spacers.
Looks great on his lowered F10, but might be too aggressive on a standard height F10.
http://f10.5post.com/forums/showthread.php?t=535457