O.K., I'm cheap. My 76 CB550F has a king/queen seat that came on it with a torn up cover, no latch post or lock mechanism. I'm in Detroit and believe it or not, there are no bike junk(breaker for you across the pond)yards anywhere close by. My question is, what years/models will bolt up to mine? It's got two hinge pins instead of the one long one I'm used to on the smaller bikes. I don't need the identical seat, the flat one will do.