Jeep driver

Hi.
My Turbo Resonator on my OM642 would seem to be broken and is dripping oil. I have the part number for a replacement Resonator - A642 140 1487 - but i can't find part numbers for the 0 rings that fit in the outlet and inlet sides. Does anyone know these please?

Incidentally, it is the kidney bean shaped resonator.

Thank you.