I am looking at my DGK306 rebuild kit I have and it does have the pressure spindle o ring and some other o rings that would be used for our pumps. The only problem i see with the kit is it has a mounting gasket for the MW or 3 hole lift pumps and not the M or 2 hole lift pups. Which can be ordered on it's own.

I did notice that there are numerous air release holes in the bag that holds all the components; that smaller o ring could easily fall out.

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Marc-André

W115 1975 300D "Geraldine"
W115 1976 300D parts/tutorial car