Steering coupler installation on steering column

Hello Everybody, Firstly I would like to thank everyone that has posted on this thread all the information has been really helpfull. I have one silly question. As per the picture supplied by Mderoy are all the coupling bodies supposed to have a dowel pin at the top near the seal. Mine does not. Would this have been a later update from the factory?
If the hole is there someone forgot to put it back That pin prevents everything falling apart.