According to my book the window trim is the answer to the custom or deluxe cab.Other things such as corner windows were an accesory.In other wrds you could have a truck with corner windows,chrome bumpers and grill,and it would still be a standard,if it just had the black rubber around the windows. The book Chevrolet Pickups 1946-1972,by John Gunnell,has a lot of info on these trucks.
