I'm just a lurker on the pro tour site but the size wheels in you examples are exatly what they use, bet they'd be interested
http://www.pro-touring.com/forum.php I've never posted there and it looks like there is a vendors only forum for new products so I'm not really sure where to slip in some pics and heads up for what you do. I'll keep reading to see if I can find an appropriate place to drop a plug.
I've been to one of their competition events as a spectator.
They have events in CA, you might want to set up a booth at one
'Run to the Coast - California- This event is a West Coast event similar to the Run Thru The Hills. The event will be held at the old El Toro Marine Base is Southern California'
Events list:http://www.pro-touring.com/forumdisplay.php?64-Racing-Events-amp-Performance-Reports
Jon