I'm needing this black plastic piece that goes on the back drivers side valve cover,

the pcv set up hooks into. I cant seem to find one anywhere. Wondering if anyone has one or knows where to get one.
Thanks

 

Have you checked Rock Auto?

 

I was unable to find it there but thanks for the suggestion.

 

Looks like GM Part number 12557672 per my old parts manual. Likely discontinued, but I hope that helps. Otherwise finding a used valve cover with it might be the only option unless you can find a similar looking one at your local auto parts store. Maybe post in the marketplace here under "wanted"?