This inner front fender well is a Press Molded Fiberglass piece that is bonded to the hood surround. When an inner fender well is cracked or broken, the front end will not have full support and can flex or shake when you drive over a bump. Replacing these pieces can be done with front end in place. Some skill working with fiberglass and disassembly of some front end components is required.
Learn more from the following Mid America Motorworks Knowledge Library article:
Corvette Body Components from Fiberglass to Resin Transfer Molding