If you already have the 55's installed... you just need to make sure they are hooked up with the correct polarity and in the correct channel. Otherwise you might need some extra foam tape and zip ties, because I think they are a smidge smaller than the stock servo's.

I hope that's what you mean...

For the wires on the servo's the dark color is the ground, the red is the positive, and the light color is the signal. Just hook them up with the same polarity that the stock ones were.