I made my own ball platform(with bushpilots pics for reference), it is on a Haulmark but looking at the pictures for a Renegade it looks the same. Here is a link to the thread on these hitches, post #19 has a link to the drawings I created and gave to a local fab shop to waterjet cut and weld for me ....
If you are looking for the end of frame mounting plate find the nearest shop that installs dump bodies(they use them for hinge mounts and hitch mounts to pull a pup). They will have/fabricate what ever you want and for less than what a "dealer" would want.
2007 Haulmark 3329DS, Freightliner Coronado Chassis, 515hp Detroit, Meritor Freedomline 12speed Autoshift, 10kw Generator, In-motion Satellite.