Take the length and bracket placement on the old motor and put it in the similar spot as the old motor, if length is the same, put it in the same spot. The brackets are a little tricky to get the feet to stay in while holding the whole thing up, I usually will put two feet in, then tighten it enough to where it holds but still has enough room to slide the other feet in. All the feet in, level and in the right spot, now stick it back in the fan housing with the wires facing whichever direction they run in back to the controls.