I got a phone call from Givi and the service tech said that the stock A620 fork clamp will fit up to a 50mm fork cover. Our fork covers are 55mm...the Givi tech said not a problem because you can get larger sizes of these clamps at most hardware stores for cheap...so he said the A620 should be fine for my bike. I also did a google search for the A620 and found a forum for Hyosung GV650 owners. There was one owner who installed the A620 on his bike. His posts also had pictures and the fork mount can be moved right down to the bottom triple tree, so it will not come into contact with our fuel tanks when handlebars are moved to the stops either way.I contacted him and he said the same thing as the Givi tech. His fork covers were massive at 70mm. He picked up 2 larger clamps at Home Depot for 70 cents each. BTW, He loves his Givi A620.
So, I went ahead and ordered a Givi A620. When I get it, I'll take some before and after pictures, and post them on the thread I started.
Here is the link to the Hyosung forum, scroll down to abelardoelias's first response, then follow what he says about mounting his A620, his pictures, and what he thinks of the windscreen
http://s11.invisionfree.com/HyosungCruisersOz/index.php?showtopic=386&st=30
