1/5/25 Update: With kits being installed on several different engines at this point, we've found a significant variation in the hole depth across engines. Some engines will require 2 washers under the nut and some will require 3. A bottoming tap is required to extend the threads to the bottom of the hole regardless of which engine variation you have.
You can find that tap HERE.
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P1 Mfg K086-M01S. Fits factory turbo'd Mercedes OM617 Diesels and possibly more.
Includes studs/washers/nuts, 1 pack of lube, and 1 brush. Fasteners are made in the USA!
 
This main stud kit was specially designed through a collaboration between me and P1 Mfg.