Trying to eliminate weeping at the pushrod tubes on my '67 triumph 500. When going online to search for seals I see listed these great pre-packaged assortment s of seals, but they are always listed for 650's. Are the pushrod seals the same size on 500 and 650 machines of the same years? The parts #'s for the seals are not listed in the posting. Thanks in advance, and happy holidays!