Use the two top link bushings to slide through the cat 1 top link pin then apply them onto the hitch.
Only use the larger one bushing(id=1 in) if your top link pin is a cat 2 pin.
Slide the shoulder bushing through the lower link pin then make sure the holes are at right alignment.
Put on the rolling pin and use a hammer to tap it through the holes of the lower link pin and bushing.