Listed here is a 1940 Chevy Taillight Lens made of glass. This lens is a reproduction of the original 1940 GM taillight lens, red in color. They fit very well and illuminate correctly.
Glass lenses have several things that make them better than a plastic lens
1. They will normally look brighter when the brakes are applied.
2. If you convert your electric system to 12 volt and use a “bright” bulb, the plastic can melt.
3. After time the plastic will tarnish and become dull, glass stays shiny longer