It depends on how old the Cragars are. The (early) 1960's - 80's rims 5x4 took 09005 RH and 09004 LH .592 dia shank style. The newer rims need a 60 degree conical. Both the (early)14" and 15" 5x4 bolt circle "only" took the .592 shank style.
They are on back order everywhere for the 09005 RH nuts. the 09004 LH nuts are available at almost any big auto parts stores. If it's an emergency you can have them machined out of stainless steel.