Ug. I looked through my pictures, but don't have one of the pre selector in neutral. At any rate.. you are going to want to run through the gears on the pre selector before installing it. You'll figure that out.
On the transmission, from memory, the two pins are an equal distance from each end, but don't count on my memory. At any rate, they'll have to line up with the slots in the pre selector when it is in neutral.
Clear as mud?