The OE metal gasket is only available from one source now. Kent has a video on this subject on his YouTube channel, and sells the correct gasket with wrench for the hard to reach bolts. I bought it, but have not had the chance to install it on my OM616, it died before I had the opportunity to install it. I will be using it on my OM617 build, but it looks to be good quality. Do a Google Search for it.

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Milan Brown 1979 240D, rebuilt OM617.952 turbo diesel, rebuilt 722.315 transmission - engine spun a rod bearing, sold to pick your part

1979 300SD, ~90k original miles, all stock