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just received new bolts for clutch pressure plate 999-510-015-01 from Porsche. Noticed the plating is entirely different than bolts received just a few months back.
Edit: I think I answered my own question. Old bolts received in clutch kit were "OEM" but not Porsche. Looks like Porsche changes to newer coating awhile back.
The new bolt appears to have the same coating (Dacromet?) as most of the stock 993 suspension fasteners. If so, its corrosion resistance should be superior to the yellow zinc coating of the other bolt.