The manifold that I purchased has an OD of 20mm, the carburetor had a sleeve that was smaller than that. When I removed the sleeve the opening where the carb slides onto the manifold is now to big. I have checked and there doesn't seem to be a sleeve/reducer that will work with the new manifold and the new carburetor.
I am working on a 58 Mobylette AV88. Anyone else have this issue? Should I just buy a different manifold? It is getting old.