Gasket

[92_Lumina_Z34]

I have currently torn apart the rear part of my engine [3.4L D.O.H.C],The auto parts place is having trouble finding this gasket and i dont know the proper name for it. The gasket is on the top of the cylinder head and on the bottom of the camshaft carrier. Can anyone tell me the proper name for this gasket

Thnks in advance
On the diagram below its number 25 (no legend to these numbers)

[taillight]

Cylinder head to cam carrier gasket. Try a GM dealer.