I have the 39l version & have just bought the 50l version on eBay.
It was advertised as having no lock & thought it wouldn't be a problem to get one. However, the new lock ends in 2 screws to attach a metal T piece which locates in a rectangular slot in the top case to lock it. My Yamaha dealer says this part isn't available as it comes with the top case. Photos of the part I need attached.
Yamaha part no. 52s-21780-09-00 is what I need & their website shows the lock barrel with the T piece. My dealer has one in stock but there's no T piece.
I've seen plenty of top cases with no lock advertised for sale so I'm sure I'm not the first to have this problem. Where can I get this part please?