Right you are on the length. I just got back from my Local ACE hardware...they have everything...as I am facing the same situation for my B Body. They were out of the 3/8 length ones so I had to settle for the 5/16 size and used washers for a spacer set up on each side of the clevis pin. It may not be "Correct" but at least no one will be able to see them any way and the entire engine bay is upgraded to all kinds of new stuff. Most home centers and good hardware stores will have the clevis pins in stock. Hope this helps. Oh...don't forget the cotter pins...