Made my own ... this hitch has been on a 2980RL and my current 3150RL. Most all Montanas are built the same frame wise as far as width and tank location. I drilled six 1/2" holes on the outboard flange of the IBeam. I had to move the rear stabilizers forward a few inches, but no biggie. Side brackets are cut down 4" angle 1/4" thick.
