You may be on the right track, Pat. Although I am pretty sure that the plastic ball joint connector in my car, 1970SL, Euro spec, 22774, Dec 1970 is original equipment, I checked all the documents I have for pictures. Sure enough, even the Haynes manual shows BOTH versions. The metal connector on page 83 in the Emission Control section and the plastic connector version on page 127 in the Transmission section.