Whether you have an Impala, Bel Air, Biscayne, or Caprice, you’ll find everything you need for to rebuild your classic Chevrolet at CARS Inc. We make the seat covers, door panels, carpet and other interior in the U.S. from the finest materials available, and we manufacture a ton of replacement sheetmetal for these cars. Muscle Car Metal is proud to offer Goodmark® Sheetmetal and Trim for your Muscle Cars and Classic Trucks. Goodmark® offers you the best parts available for your car- no excuses. Goodmark® is the largest supplier of Sheetmetal Parts in the GM Restoration Parts Program. Vehicles manufactured with a unitized body (no frame) can be affected by even the most minor accidents, creating sheet metal panel alignment problems. Take into consideration that tolerances on older vehicles are not nearly as precise as modern vehicles. Click the icon above to display Year, Make, Model Selectors, Search Box, and more links. Jan 29, 2019 · I use 18-gauge AK sheet metal for most of the customizing in our shop. As a rule of thumb, I try to match the gauge of sheet metal to that of the panels on the car that I’m working on. For a stand-alone project, 18-gauge is a little heavier than necessary, but this thickness does allow for deeper shapes to be formed into the metal.