I know my tail light bezels have seen better days. The chrome is starting to bubble, the black inner section is slowly turning gray. There isn't much to solve this dilemma besides replacing them.
Marquez Designs out of West Sacramento, California, produces a bolt in replacement tail light for 67-68 Camaro. They machine the bezel from 6061-t6 aluminum to insure a smooth finish and perfect fitment. The inside of the bezel is media blasted and can be painted to emulate the look of the factory pieces. The lenses come in all-red for the RS models, and red/white for the base models with integrated back-up lights.
They sell for $485.00 a set.
They have many other products for early Chevys including second-gen Camaro tail lights.
Visit their website at Here (click parts)