I am in the process of rebuilding the motor on my '66 GT Convertible and I just had the distributor rebuilt. When I got it back the vacuum advance had been changed to the type for a rubber hose and not the threaded solid tube type. The original one is bad. I have searched in numerous catalogs, auto parts stores, etc... and I cannot find one of the original threaded types. Does anyone know where I can find one of the original ones or what other alternatives are available? Thanks in advance for this great for and all of your help!