No pin is needed -- the **** comes with the shocks and fits into the top of the shock. I leave my rear ones always attached.

As for that guide, it is not fully correct for the Koni installation procedure. The Koni's do come with instructions, but they are not very clear. They do detail how things need to be assembled for the Koni's.

Essentially you will need to remove and reuse the dust cover pieces and bump stops from the OEM shocks, and drill out the metal part of the dust cover to fit the larger diameter of the Koni's.

This post has a lot of photos of a Koni install. Note that if you are are at stock ride height, you don't have to trim the bump stops. I did not as shock bump stops can act like springs and I wanted as much spring rate as possible since I am autocrossing the car.
https://www.crossfireforum.org/forum...ravaganza.html