My 1977 CB750Four broken the gear box during a trip in France. I immediately tought to CMS When the official worksop in Turin (Italy) told me he could not find there some spare parts to repair the bike, so I bought it at CMS together with some other required parts. At a glance this double gear looks very fine in its envelope. Unfortunately until now I cannot check how it works because I didn't find yet the damaged fork which connects it (it is out of stock at CMS and results available only as used part in USA) but as usual I'm absolutely confident about CMS parts good quality.