Hopefully someone can help, I have a leak coming from the B2 piston cover on my 1991 300D. I ordered the supposed O-Ring but it’s looking way to big, does anyone know what the correct one I’m looking for is? Everything I look up just comes back to the one I bought.

Part Number I Ordered: 0059977048

0069977347

https://webshop.ganzeboom.net/722-4

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92 e300d2.5t
01 e320
05 cdi
85 chev c10

Thanks but that part number is for the smaller thick black seal inside the housing. I'm looking specifically at the larger red seal for the piston cover.

any tips? looking at the red seal behind the piston cover.

0069977347 is for the wider black seal inside the housing