Issue: Crank bolt backed out and went MIA during use. Problem locating compatible replacement hardware.

I do know that I can use the crankshaft bolt from most w124 and w140 chassis cars as well as some w126's, etc
I know the following models have the bolt I can use: OM603.912, .913, .950, .960, .961, .962, .963
all OM606 models
M107.99x Petrol Engines.

I have not made progress using any of our parts sites nor with local parts/yards as i'm only running into complete engines where only option is buy the whole engine if I want the bolt.
However I have found 1 crankshaft bolt that was removed from an OM603.971 Engine. I have not confirmed if it will fit and thus I havent made a move on it.

All in all, what's your $.02 on this $30 bolt?

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-“Never trust a mechanic who drives new cars. They're either charging too much money for their work, or they can't keep an old car running - maybe both.”