Interesting. I found a deal on a used ZL1 rear fascia from a wrecked car and just had it repainted. Had I known that the marking points for the diffuser attachment were there, I'd just bought the rear diffuser...
I'm surprised that no one seems to point out the particular part of the ZL1 diffuser that is the PITA: inserting the diffuser onto the tab, on either end, last before you engage the side portion of the diffuser at each side. There is some real gymnastics going on there, even with the entire rear fascia off the car. You end up essentially bending those last tabs (these are a very long side tabs) considerably; I'm sure if one were careless, they would snap them off.
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