Napa had these available IIRC. $20, and it comes with the threaded collar.

Edit: https://www.napaonline.com/en/p/KAT28216
Napa part number KAT28216

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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