I have seen a number of threads (maybe even one started by me

) on using the Kickfix system with the Ortlieb handle bar bags. It is supposed to work but I am just not seeing it or maybe I missed something.
It is supposed to work with the Classic?? My bag has sort of a square block on the back of the bag it slides into a slot on the bracket that attaches to the handlebar. When I look at pictures of the Klickfix I see a flat surface. No slot for the block on my bag.
How is this supposed to work or does it work on Ortlieb bags other than the Classic? Or is there a specific type of KickFix mount that I need?
The bracket I really like is the NEW CADDY horizontal mount.
Dahon Bags and Luggage
It is advertised for Dahnon but I am don't see a reason why it can't work on other types of bikes.