Matching hardware to all of the possible "holes" a person comes across in a lifetime is a huge PIA. Especially if you add in old hand tools, and even a lot of powered stuff. 

History had, and passed by many pitches, threads, and whatnot that one can hardly find a match for. At least none at a very well stocked hardware, and ridiculously hard now that you have to do most of it online, and can no longer bring the item to be matched with you into the "store"

My most recent search finally had me handing the part over to a Tool and Die guy I know, and he made me hardware, Perfect fit, but if I had to pay for it, would get pretty spendy, pretty fast.