I am doing the swap currently and I have a set of zl1 fenders and an SS fender. I can not see any difference in the fender itself. That said the brackets on the front that go from the core support to the front of the fender are drilled different so that it pushes the bracket out apx 1". Also note the under tray that bolts from the subframe to the bottom/front bumper will need changed, and you will have to get zl1 brake ducting for a ZL1. What I do not understand is why the zl1 fender part number is different.
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