My goal - A medium sized soft bag for day to day stuff and a top box for hitting the shops or locking up the helmet. After scouring the forums it became apparent that the JC Whitney top box at $85 shipped including mounting plate was the deal-de-jour. Except for a stupid iron cross that you can pop off the top and throw out, it looks and feels like it will do the job just fine. I didn't want a hassle swapping back and forth, so I bought some flat and angle aluminum stock from the local Nobodys Home Depot and made a custom frame to fit the KTM soft bag to fit it to the JC Whitney top box mount plate. I can now switch back and forth with a single screw! Originally I was going to mount the JC Whitney top box plate to the KTM one, but it was backordered so I simply drilled holes in the plate and mounted it direct using some round aluminum tubing to make spacers. I had run down to the store and bought some metric bolts for the mounting, but lo and behold, I get it fit and realize that the bolts that came with the top box were exactly the right size, so all you'd need is some spacer material. Here it is - The el-cheapo home hack job that the janitor at KTM should have engineered for the not-so-hard parts catalog. An advantage of making my own plate for the soft bag was that I could engineer it so that the bag doesn't hang way off the back. It has to be removed to take off the seat, but its a snap with a single screw. The screw hole is visable in the rear view pic. I just used a sheet metel screw going into the top box mount latch thingie. If you wanted to be really Gucci, you could use an aircraft style ball lock pin here for a tool free installation. I threw on a 'Boz Bros' sticker and a piece of pin striping tape to give it that factory look... Cheers!