You will need the one for over 58" between the landing gear. Mine was right at 60" if I am not mistaken and that is the kit I used. You will it regret the purchase. It's a bit time consuming to install but worth it for the stability.
It's not as bad as it seems. If you have any trouble feel free to message me and I will try to help you in any way I can the front is pretty straight forward. The back was a little tricky. Just make sure you don't over tighten any of the joints on the front landing gear. I made that mistake and had to grab wrenches and loosen them all so I could pull the landing gear up.