I would advise you to get an OEM PCV valve. Many people says the aftermarket one's don't have the same properties as OEM's do.
Just in case and even if you get an OEM or aftermarket PCV, the new one will come with TWO openings instead of just one (not sure if your model needs both openings) and a small plastic cap. If you need only one, install the cap on the upper (smaller) opening and you're all set.
Let us know if the spark plug and boots make any difference.
Oscar.