are you talking about this ford style canopy?
only pics i have of my '77 with it. they fit, but personally i would hold out for an older chevy one. the ford fits fine, but from the side, makes the truck look like a humpback....
managed to find this sitting behind a farmer's barn for 10 yrs, for $250. fits real nice, matches the cab lines perfectly. too bad your so far, since i got my camper in '010, it's been sitting in my shed....