Can't help you on the factory end. All my experience was in a small repair shop that had the contract with the local Chevrolet agency. I came on board at about the time Chevrolet was making the Chevrolet agencies responsible for the installation of accessory radios and associated repair. This was in 1947. Over the years I have collected almost all of the equipment and publications that were a part of the contract. Most of it has been posted on this forum in pictures. 
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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