Mysterios gasket in the valve cover

[Eduardsxd]

Hello!
Currently working on swapping a E36 M42 in an E30 touring.
Took of the valve cover, to clean.
In the valve cover there are two metal plates. One with some kind of oil jets and the other one blank.
The one with the jets has some kindof gasket, there is a part number on it "11121739608" but there is no info on google or in realoem.
Anyone know what they are?
Attached is a picture, i can take more tomorrow is necessary.
Thanks!