The rears I just put on my 23 ZL1 had no tape, used the existing 3 screw holes in the wheel well liner with the supplied hardware. I didn't use these on the 23 or the 18 1LE that I did have, the ZL1 Addon's on the front are too short to do any any good so I used the $15 universal, it's the only thing that works but you'll trade off a little bit of aesthetics for a product that actually works.
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