That number on the radiator support is the shipping order number and the last 5 digits will (or should) match the digits under the word "NUMBER" on the fender tag. To my knowledge no one is reproducing any kind of tag or plate with a VIN number on it - something about against Federal law. Your missing VIN tag is made out of stainless steel and is is about an inch or so by 2 to 3 inches and was secured with some kind of special glue. All 5 of my early A Bodies have the tag and no rivits holding the tag to the jamb.