I found some stock 18" silverado wheels. Not sure if its worth changing out for these though. The 20" tires dont seam super expensive. Anybody know how the 18's fair $ WISE
If you are still looking for pics, here is a link to mine with replica chrome SS 20's. I love these wheels.
http://www.tahoeyukonforum.com/forum/showthread.php?t=26479