You probably have Atwood landing gear. There are several gear sets that are each different for the Atwood. Compare all the dimensions before you give Amazon the order. When mine stripped the bronze threaded bushing inside the leg I just replaced both legs with complete units. Heck, you've got the leg off now so why not just replace it. BTW I have the same year Montana so probably the same OEM Atwood legs.
2011 2955RL Reese Sidewinder 5th Airborne
2014 RAM 2500 CD Demco Recon Hitch
4X4 Crew Cab/Short Bed