My 1977 Cadillac Seville Vacuum Advance has two ports. The vacuum advance is not working on my Cadillac Seville and therefore, it failed the CA smog test. I have called so many companies and parts stores across the USA for a 1977 Cadillac Seville Vacuum Advance with 2 ports to purchase with NO results. Can I have a 1978 Cad Seville Vacuum Advance installed with one port on my Cadillac?
Also, can I add a 'T' to the 1978 Cad Seville Vacuum Advance, so that it will pass your CA smog requirements? Presently, with one added 'T' it will not pass the CA Smog required 'Visual Test' for my 1977 Cad Seville Vacuum Advance.
Lastly, where can I purchase a new 1977 Cad Seville Vacuum Advance with two ports. Also, are their any 1977 Cad Seville Vacuum Advance companies that can rebuild my part?
Thank you very much for your efforts on this matter. I await your reply.