Hey Skull ,you can buy support brackets that bolt on to the top bolt of your shock and the guard mounting bolt behind it the problem for you though is the detachable setup uses the same bolt i had the same problem you could probably get a longer bolts i ended up selling my bags and getting a luggage rack and sissy bar bags these brackets are fairly common m&m should be able to get them for you if go here this is what they look like http://cgi.ebay.com/ebaymotors/_Motorcycle-Parts-Accessories__CHROME-SADDLEBAG-SUPPORT-BRACKET-FOR-04-08-XL-MODEL_W0QQitemZ110264919463QQadnZMotorcycleQ20PartsQ20Q26Q20AccessoriesQQadiZ2863QQcmdZViewItem?_trksid=p4506.m20.l1116

There's a guy on Ebay making supports that will work with your backrest and save you scuffing up or busting your bags (or worse). Click here for link.  He posts world wide.