The replacement inner fender tubs from Anvil Auto come in three flavors. The lowest cost is a paint-grade fiberglass version for $975 a pair. Next up has a carbon-fiber top layer (satin finish) and a fiberglass bottom layer. These cost a bit more at $1,250 a pair. For those with fat wallets, they also offer 100 percent carbon-fiber tubs (gloss finish) for $2,250 a pair. We chose option two for our Camaro.