~~Here is a set of 12 Staples for your 1936 - 1966 Cadillac. These are to the Original Specs & are Hard to Find.  These work in many applications including:  Seals, Felts, Rubber seals on the outside of the car, like A-arms, Lots  of other areas.  These measure approx. 7/16"w x 7/16"h.
If you are restoring your Cadillac, These are what you want.   Please see Picture.