There is another company that makes a sliding mount for the pack.
Saw it at Street Vibes.Was kind of costly but seemed to be well made.I cant recall the name.
I put a Kuryakyn set up on my 03 RK, was a challenge to install but did the trick for the little woman to ease back little further or to ride more upright as needed. Is a little heavy, I did add a secondary stop block soit cannot go full back and happy with it so far. The Legends system seems abit more practical and easier to adjust, the Kury unit does stick in the tracks from time to time needinga little force to break it free.
click on the link in Casper's post. This is the design I made. Once you have moved it to where your wife is happy you will never move it again anyhow. You can make this one for 25 or less in you have any skill at all. 2.5" makes a huge difference in her comfort.
kc classic