In your pic it looks like the PCV valve plugs directly into the hose, I don't see that smaller plastic thing that is in the pic of the GM part..
Does your old hose have that plastic piece?
If so I'd just try wiggling it, or if you had to carefully slice into the hose, of course I don't see the plastic thing in your pic, just on the GM part pic, so I am not sure how to advise you, can you get a pic of your hose showing the plastic piece that is in the GM part pic?
Oh I see now, the black plastic part is on the other end of the hose/
If you can remove that from your old hose then you can order the ACDELCO 12556932, if not go for the GM Part since it looks to have that plastic piece already attached.