I just found another vendor:
Install GM Xenon Headlights into your non-RS without using the factory wiring harness with this Plug and Play module!
Easy to install, takes just minutes and enables your Xenon Low Beam, Xenon High Beam, and Halos to function just like an RS model!
QUANTITIES LIMITED!
http://www.automotivelightstore.com/bixenonharness.aspx