I have a lock and ride front cargo box on my sportsman 550 and recently built a removable wood carry-all box to install on top. For chainsaw, extra gear/etc. Worried about is sliding around when strapped down so I decided to build a 1/4" plywood boss on the bottom of it to allow it to lock in place with the recessed pattern in the top of the Lock-N-Ride unit. If anyone is interested in the template to make one, I can email a file to print it out. I'm a NEWBIE to forum but will add pictures if I can and anyone needs a visual.