Body Model Nomenclature

[Charles Reese]

By now I should know this, but don’t!
My Parts Price List (7-1-’31) has a table of “Body Models.”
Of particular interest to me: I note that the "Commercial" list shows Body Model “76-A Open Cab” and a “78-A Pickup”. So how do I properly refer to my January ‘28 ‘Open Cab Pickup” (early longer bed)?

Sorry ... it's too hot outside to play in the garage, so am doing some research