Who’s on first that’s what I want to know. This thread is quite comical.
The dust cover is not shown here, it is on the OEM shocks. The thread on the rod end of the OEM shocks is smaller in diameter than the Konis rod thread and therefore the hole in the OEM dust cover has to be made larger to fit the Konis rod thread.
The dust cover protects the rod from dirt and rain etc. It fits directly over the rod end and goes halfway down the cylinder.
There is no pin with these shocks just the adjustment **** and the hardware shown. All the adjustment is done with r
the **** on the threaded end of the rod, it just slips in place and you just turn it.
I did mine nine years ago so I may be in error in places.

The OEM dust cover on the new Koni shock. Photo by downwardspiral.