[truckster]

MY means model year. The single wall top was a late 71 to 72 only option. The earlier Blazers and Jimmys got double wall tops. Power windows were not available from the factory. The steering wheel on yours look like it's from a later model. Is the horn button round or square?

Some of the other available options were locking differential, skid plate, tilt wheel, tachometer. I wouldn't get too hung up about those. Even without them it looks like you've got a nice truck. How's the sheet metal?

Oh, and welcome to the board.