Does anyone know the part # for a 235 vacuum advance? The advance on the 1954 261 took a dump. I am assuming that the 235/261 vacuum advance units are interchangeable. If they are not please provide the part # for the 261 unit.

I am trying to buy one locally at AutoZone or Napa so any Napa or Wells part #'s would be very helpful. The insolent gum popping counter people at both stores have indicated that such a part does not exist even though I brought it into their store for a cross reference. I can't wait to see the look on thier faces when I walk in with vaild part #'s

Thank You