I think that is the brand I have.
Mine was already on it, but I think I understand what your saying.
I can't get the back part on by myself. I need a little help keeping it steady and lined up.
Kinda hold the back part (by the back door) up, while pushing the front groove onto the targa part of the tracker. Once you get that part, you can line up each side as you push it on.
It is kinda difficult to do, but I'm sure that after you do it a couple times, you will have it figured out.
