Finished recoding. This will not impress any locksmith, but it worked for me. I had already verified that the key I wanted to use was the same width or wider than the one I wanted to replace. This meant I could make the saddlebag key work by removing material from the tumbler keys (if that is what they are called), which would be essential since I did not have any spare tumbler keys. Here you can see the two tumbler keys sticking out when the saddlebag key is inserted: Here are the tumbler keys that needed modification by removing material inside the slot in the thicker end: In progress of filing the slots larger to fit the key: Finished, and working as planned. Now I not only have one key that fits all three locks (both saddlebags and top box), but I also have a spare key – the bike came with just one ignition key and one key for the top box, plus two keys for the saddlebags.