I've never seen any. Are they welded to the frame?
While I don't have the RK, I did make some brackets that I attached to the frame of my chopped RK and added Primo fold down side tables.
Not really clear on what you want to do, but here is what I did on the Mini Ranch
If you look at the upper front L&R leg brackets, I used hole plugs backed with silicone to cover the holes for the handle. I assumed the handle attached at these points, unaware of a bracket - something I should look into.