Upper case and trackpad?

I've replace a couple of the new MB Air topcases. They don't come with the trackpad, it's a separate part. If you get a new replacement part it comes with the two springs and eight screws and the set screw to replace the trackpad. I doubt a pull will include those. I close the book with some kleenex between the pad and the keyboard to give it some support. Then put the spring in place and use a small Phillips to line up the hole on the far left and hold the spring in place and then insert the far right screw. Next I put the rest of the screws in loosely, make sure the positioning and alignment is correct before tightening then down