Ford offered two different types 1973/79, both were actually supplied from Open Road.

1) Fibreglass camper shell, has compass emblems on either side in front of the side windows. Two versions of side windows, fixed and slide back/forth.

The front of the shell is raised, could be painted body color, and most I've seen are like this.

2) Over the cab self contained slide-in-the-bed type.

Both are shown along with all the individual parts (including the self containeds toilet!) in the 1973/79 Ford Light Truck Parts Catalog.

Ford also offered their own M450/500 Class A Motor Homes 1973/77.