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If you are talking about the "hidden number" that was mandatory by federal law after 1962 , the stamped number on radiator support the numbers are : first digit is year (3) , digit # two is factory I (note in roman letter) is Lynch road , 7 is ST Louis etc. Next three is build date month and day ( 603 is third of june, found also on fendertag) The month okt-dec is A-B-C (at least on -65). The last digits are the same as on fendertag (invoice number) The number on sheet metal ( like battery tray, fenders etc. ) is just factory numbers, not related to partnumbers. Note: all digits except the two first ones are found on fender tag also