The pumps with the hole in the top of the door came with a bolt like rod but no head on it. Items like are shown in Matt's picture slide on this rod. Many cities or states required the price of the gasoline be shown on the pump, this is why this was provided.

Jack Sim

Author, 1st & 2nd editions of Gas Pump ID book, 3rd edition is now available at www.gaspumpbible.com
Air Meter ID book also available