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I agree with Chris. If they are black oxide, that's a DIN spec stud, but the factory would have specified yellow zinc for corrosion resistance in the aluminum case.
What stud remover are you guys using? I have a HAZET 10mm but I don't think it's intended to be used on the threaded portion of the stud, only the shank. At least when I used it to remove my headstuds it buggered the threads big time (no problem as they went in the garbage). But now when I contemplate R&Ring studs (such as the ones on my manifolds, see my other thread) I want something that won't damage them.
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'66 911 #304065 Irischgruen
‘96 993 Carrera 2 Polarsilber
'81 R65
Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13)
Ex-'88 Carrera (Sold 3/29/02)
Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04)
Ex-'89 944 Turbo S (Sold 8/21/20)
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