gmcyukondriver
Built, not bought.
Finally, going to pick these up in 10 minutes. Just saw the ad and called. He said they're 5.5" x 3.5", which is perfect for the diesel bumper opening. I'll need to fab up a bracket and get a wiring harness, but I couldn't pass this deal up.
http://modesto.craigslist.org/pts/3978676093.html
http://modesto.craigslist.org/pts/3978676093.html