Reproduction of the original "ANTI SURGE" vented gas cap for various 1969-70 GM models. Designed from the original OEM cap with all correct markings. Includes the correct "S" marking on the center rivet for complete authenticity making this the most authentic reproduction available anywhere! Manufactured to exact specifications with the "show car" restorer in mind. High quality representation of the original and now "hard to find" vented gas cap.