Corvette Central suggests use part # 203013 retainer kit with this bumper.
All fiberglass replacement parts are considered collision parts and should be fit to the car before final finishing.
It is normal for these parts to have chips, scratches, and even minor cracks when received. This is considered to be normal and is not a reason for parts replacement.
Fiberglass vs. Urethane: which one to choose?
Fiberglass bumpers are a solid material and therefore need to be fitted to the body. Sanding and filling the bumper, and in some cases the body, will result in perfectly matched bodylines between the bumper and the body. Fiberglass bumpers do not have the ability to absorb even minor impacts without breaking thesurface. However, Corvette Central now offers TruFlex bumpers, which are constructed of fiberglass and a revolutionary new resin, which makes them 70% more flexible than standard fiberglass bumpers. After fitting, TruFlex bumpers can be painted without adding a flex agent