I bought used OEM bags (with keys) and mounting hardware on e-bay. Instructions and diagrams are available on a variety of web sites. I found an exploded diagram of the whole assembly. That's how I figured it out. Now I have a 'rare' 2001 Tourer. Follow the links supplied by prior responders.
Here's another link to a diagram -
http://www.hdlparts.com/fiche_section_detail.asp?section=148567&category=MOTORCYCLES&make=HONDA&year=1999&fveh=3473 Have fun - it's easy - hardest part is getting the paint to match.
Expensive? Maybe, but the OEM approach will prevent damage that one time you start tipping it down on the side stand and realize too late that the darn thing flipped back up. Don't ask how I know.
Joe V.
Joe V.