I have the SL 2-piece wheels, 18x8.5"(ET 25), and 18x10(ET 25). I also run a 15mm spacer on the front to make the wheel/tire exactly flush with the edge of the fender flare.

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Gary
1992 500E
1995 Impala SS
2000 C5 Hardtop
2006 Hummer H3
G Man's Rides