Your probably also going to have to cut out a notch on each side of the receiver box to fit the wires to.. so u can mount the failsafe on top of the box. I have the Duratrax one.. works fine.. Actually they're all the same exact thing.. so just go for the cheapest one u can find. The only difference is some can also measure temperature, speed, etc. I can post a pic of the notches if u need em.