A discussion in a different thread led me to wonder about which features were optional in the GT production run (US spec cars). I know that the 1.9L engine and auto trans were optional, but I wasn't sure about things like rear window defroster and other stuff. Obviously, exterior and interior colors were options from the factory. I know Buick dealers were fond of adding various geegaws and doodads at the dealership like vinyl tops, AC, body side molding, etc. (see pamphlet below) Unlike today's cars, however, there doesn't seem to be a lot of factory available options for the US spec GTs.