I have a 1964 roadster built in December of 1963 that has a cadmium plated booster. The numbers appearing on the booster where the halves come together are "4311" instead of "4310" as specified in the judging manual. Does any one have any idea as to what this booster is supposed to fit? Could it possibly be an assembly line substitution, or is it a later model replacement? Obviously I don't want to restore it if it's wrong for the car, but by the same token I don't want replace it if it's possible that it's original. I hope some one can give me some knowledgeable direction. The car did have a replacement master cylinder when I purchased it in 1986, so it probably is a replacement booster, but I want to be sure. Thanks, Phil