Auto Metal Direct (AMD) - our panels are made from proper gauge steel and include all correct-as-original clips, tabs, flanges, bends and seams. Each time a prototype body panel comes off of a new tooling, we test fit it on a car. The marked up prototype is then used to change and improve the tools, and a new prototype is produced. This procedure might be repeated multiple times but, once the part is finally approved, you can be assured of a quality part. Classic Headquarters (CHQ) - for over 30 years the world's premier manufacturer for high quality, technically correct restoration products for General Motors Musclecars including - Camaro, Chevelle, Nova, Pontiac, Full size, Corvette and Chevy Truck. TriPlus has been producing accurate and authentic high quality body panels and glass for valuable classic muscle cars and trucks for many years. X-Parts parts are third party products offered by AMD as a viable substitute for a product that we do not yet manufacture on our own tooling. While not the same superior quality as new AMD parts, these body panels are considered to be a viable solution on most vehicles. Some panels may require additional body work during the installation process but, all panels have proven to be workable in the restoration world.