A 1953 Chevy red upper Taillight Lens. The lens is a reproduction of the original GM lens, red in color. The 1953 Chevy has 3 lenses as part of the taillight assembly. Those 3 lenses being the upper red lens, center red lens and lower clear or white lens which is the backup light lens. All lenses being plastic. Both the upper and the center lens being red in color and use a dual filament bulb while the lower backup lens is clear or white and uses a single filament bulb. There is a 4th lens involved in the 1953 Taillight Assembly. It is a flat inner red defuser lens found inside of the upper red lens. It defuses the filament light when the brakes are applied.
One important point to understand in reference to 1953 versus 1954 Chevy Taillights. The rear fender area on the 1953 or 1954 Chevy where the taillight mounts is the same for both years. But the backing plate that the chrome bezel mounts on, is different on the 1953 and the 1954 Chevy. So to change the taillight assembly from 1953 to 1954 you need to replace all the lenses, chrome bezel and the backing plate.