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This item NUBEHONE Front Bumper Lower Lip Splitter Carbon Fiber Look Fit for 2015-2019 Chevy Corvette C7 Z06 & Grand Sport Replaces OEM #22922352 ABS Plastic - Hydro-Dipped Carbon Fiber. mfg said this does not fit if you have a stage 3 with winglets
Manufacturer Part Number NH-C440V01
It's most likely because they didn't drill holes in the side for them. EOS does this too with their splitters, the stage 2 kit they sell are undrilled at the sides and require you either drill it yourself or use double sided tape.