You need one of the original Master Parts Catalogs which reference the fasteners and bolts by original part number. These sell as originals or reproductions from vendors and on EBay. I am finishing a ground up rstoration on a 1950 and you will be referencing several hundred individual pieces it may be easier to go the route suggested and buy the bed bolts, front end bolts, Interior screw sets etc. In the long run cheaper and easier on the eyes it can be laborious going through the books and x-referencing these items.