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Got a used set from Gene at Karshop with a switch, bought the crush nuts from the dealer that the lights mount to. I didn't get a used wiring harness so I bought the pig tails for the lights from Gene Culley at GM parts direct. Bought the Black (Ground) and Purple (power) wire from NAPA. After I spent all of that it cost more than PIAAS which have better performance. But I like the stock fisheye look and use of stock components. Good luck. Do a search on 'Fog Lights' and someone posted a schematic for the circuit. Even though the wiring IS NOT in the FRC, the relay is in the fuse box in the battery compartment. Good luck.
I'd look here in the For Sale section for a set of used ones from a Vette being parted out - At least you'll be able to keep someones Vette alive by using their lights!
From: Wylie TX --> Less is More, except under the hood !
I wish I had of done this years ago !
Here is the write up I did on installing C5 Fog lights in my Z06. I then installed HID bulbs in my fogs, and low beams. Its not difficult, just a little elbow grease and common sence.
You will not believe how cool the HID fogs and low beams look !
Nothing else even comes close.....