Picked up some Ichiba 20mm bolt-on spacers from a local shop!
Install was easy, but it seemed like the ichiba bolts weren't fully seated.
I torqued them down until they felt solid, then re-torqued them to 80. All seems good so far and the offset is just about perfect with the stock sport wheels!
(11/07/2011)
Some pics to show the offset at stock height.