Hi guys.
I have an E52 top box and two E41 side cases. The side cases share a key whilst the top box has it's own. I know there's a kit available to change the locks so one key fits all. I have no idea of the cost but i've just managed to sort my top box lock so the side case keys fit's it. Now one key fits all.
It's a very easy mod, you just need a little patience and some basic tools.
I also used the same method on my Gpz900r that had three different keys for fuel, seat, and ignition. That also now uses one key.
Would it be worth me posting a step by step guide with pics, or would no-one be interested?