20 offset would PROBABLY fit with a 7.5-8" wide wheel, but having the low offset on that narrow of a wheel won't have the "concave face" I'm sure you're looking for. Stick with around +30 with a 8.5-9" width, just watch the rear trailing arms. Plan on running some camber, and replace or flip your tires often.
Sorry Mark, I think it's gonna be here for a while, just hasn't affected the DSM/GVR4 crowd much.
*Mark not Curtis because I am stupid.