I am trying to fit the revo wing mount on my slayer, but I am having a small problem. It seems that there is a piece missing. Is there anything that connects the wing mount back to the bumper? There are 2 holes that are on the back of the mount, and the bumper has a piece that is removable, but they do not seem to quite line up. I was looking at some other pictures like lime sluggy, and the at&t racer that both have it, but can not quite tell how they were done.