GM Canada used a common radio for some of it`s cars and trucks. They are called a `GM Auto Radio`. There is one, a model 500 on Ebay right now. The dial that is shown is for a car mounting with the dial at the bottom of the unit. For the truck it would be flipped upside down and another dial installed. The controls are adjustable in the horizontal direction at the front and the angle of the controls and dial assembly is adjustable. They are comparable electronics wise to the US Delco radio for these trucks. However the power output is higher due to the push pull output stage. You can read about these types of radios on the ``Old Chevy Manuals Online `syte, starting with model 510.
