It is a little time consuming and you need patience of a saint and good eyesight. It is essentially a game of trial and error for each tumbler. Having some electrical tape to holds bits in as you builld them is helpful. Once built you have to work out how to get them in the panniers. Set aside an hour or more at least.Is it hard to key in the locks yourself to the ignition key?
BTW There is a single Honda part number which is the two panniers with the two locks included for self fitment.