Hi there! The only systems I see are for '00-'06 Honda Transalps 650s and Transalp 700s (year not specified). I'm not familiar enough with the bikes to know what was changed between 1999 and 2000, so can't say if the system would mount up directly. I'm happy to ask the factory, but not sure if they will know if they haven't produced a system for the older bikes. All the Holan gear is shipping from Poland to me in New York, then being distributed from there.
You might want to check out B_B's work at this thread.
He seems to know quite a bit about the Transalps and might be able to fix you up with a system directly.
Let me know if you have any other questions.