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Thought this may be the proper place for this: MotionPro has a good buy on carb vacuum synchronizers, complete with threaded brass tubes(Our XS's come with'em already installed from factory), vacuum hose that you cut into 4 equal lengths, and bottle of mercury(fun to play with as a kid) all for $65+tax. Total for me from one of my local bike dealers minus 10% discount was $70.33. That is part #08-0010 from MotionPro.