v10 rear OCV leak

On either bank near the rear of the engine, jsut behind the valve cover there are oil control valves for the cam phasers. It looks like i have a small leak from them.
audiparts has very poor engine diagrams and nothing on this.
Are they just O rings or is there a metal gasket in between to seal as well?
Anyone got diagrams or PNs for this?

Thanks.

They should be just o-rings. Not sure if you can get them separately though.

from the other audi boards a member posted this for anyone looking:

O ring. Pn: WHT 002 789
size: 14,8x1,9