When replacing the timing chains or other maintenance work, with the need of removing the cylinder head cover, better replace the two rubber gaskets. The gaskets should also be replaced too, if oily spark plugs are detected (oil on ceramic isolator).
The set consists the outer and inner rubber gasket .
Scope of delivery:
Cylinder head cover gasket set
(GM 12605173 / GM 12593309 / REINZ Germany)