Bolt and fastener identification is painful at times, that's for sure. Take a look at this pdf file , you may find what you are looking for. This is from the 1954 Parts & accessories manual, Standard Parts. Hope it helps.
Ron - - Dusty53 1954 Chevy 3604 In the Gallery Forum "You can't dance with the Devil and then wonder why you're still in Hell." "They will forget what you've said, and they will forget what you have done but they will never forget the way you made them feel."