i have purchased a two owner 1954 f-100 that has not been tagged since 1976 about 12 or so inches from the glove box toward the drivers side is a round hole about 3 inches in diameter with two small sheet metal screws right above the hole,this hole looks factory but there is nothing mounted in it
Does anyone have any ideal what was mounted there
the only thing i can think of is maybe a clock

 

bet it's for a radio #ad