I found my originals so rusty but under the washer they seemed to be black phos. Any way the bolts are 5/16 course and have a self thread point, The head is depressed and is 1/2 drive. About 1 in long. The washer is also depressed in the center with internal star. The OD is about 1 3/16 to 1 1/4. To cold to r &r for a pic just now but that offset depressed flatwasher with the star teeth is hard to miss John.
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