Check this site. He also makes a DIY harness.
http://www.gen5diy.com
http://www.gen5diy.com/exterior/ZL1/...conversion-kit
"For customers with Non RS cars without foglamps, we can help you obtain the lamps you will need to use."
BTW this should be under "Cosmetics and Lighting Modification Discussions"
Less ZL1 owner butthurt about conversions there and more people that have accually done it. People here just bought the car with it already installed.