Perfect fit for my 2003 Buell Lightning XB9S. As with any filter, it is best to change it at every oil change. It's hard to say much about the internal quality without cutting it in half, but it seems good enough. As others have said, the 17mm nut is a sleeve - it makes removing the filter a lot easier. Be sure to fill the filter with oil before installing it to prevent the engine from running without oil for several moments after an oil change.
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