Where to get the little light bulbs

They are indeed bayonet-base (metal push-twist) in '64. 1966 was the first year for the all-glass wedge-base bulbs. You can use #1895 bulbs or for bulbs with less-problematic nickel-plated base instead of plain brass, use type T4W (Sylvania 3893, Wagner 17131). For a brighter upgrade bulb use Osram 3886X.