All original radios and the undisturbed dash were of the two post style. If the radio is missing and the dash has not been modified, there should be three holes, not one gaping hole. There should be two small holes which the posts for the radio ***** go through, one on each side of a much larger center hole for the face of the radio. If you want to go back to original, there are dash repair panels that you can purchase from various vendors.

Spare tire carrier. There were two types of spare tire carriers. On a Stepside, there was an option where it was mounted on the left side of the bed, in front of the rear fender. If this option is on the truck, the rear fender is slightly different as there is an indention into the fender so that the tire could fit while hanging on the mount. The other place for a spare tire was underneath the bed, hanging off the frame rails.
Spare Tire. Does it have one? Is it the right size?
Jack. The stock jack, if it is still there, should be under the seat on the driver's side under the stock bench seat.
Steering wheel and column. The stock steering column for the 1960 - 1966 trucks did not have a switch for hazard lights on the column. The switch was separate and mounted under the dash. If you see a 1960 - 1966 truck with a hazard lights' switch on the column, it is either a custom steering column, a later model Chevy / GMC truck column or another make / model column. If the truck has been hotrodded or seriously customized, usually it will have a Chevy / GMC column or a custom aftermarket column that is derived from the Chevy / GMC - type column because most aftermarket wiring kits are setup to wire right into a Chevy / GMC - style steering column.