Will a 15x7 w/+31 offset wheel w/205/55/15 tires fit on an xB with ~2inch drop. I'm also looking at the One Ton Garage axle spacers on the rear to give a better flush fit. So, will it work? Anyone have any experience with or pics of a similar set-up?

Thanks in advance for the help!

They will fit just fine, no additional mods will be needed, even with a 2 inch drop.

Will the axle spacers in the rear be needed at all then?

i would recommend that 5mm shim in the rear
just to push it out a lil considering the rear hubs are a lot more in than the front..

u can safely run a few mm's in the back extra.

The question was are the rear shims needed--and the answer is NO, they are not NEEDED.

Of course you can run spacers or whatever else in the rear if you want, but they are not NEEDED to run the wheels you described. They will fit fine and clear everything without a single problem without any additional modifications to the car.

Spacers will make it look better.

u can get even lower offset than +31...dont worry about it...