For 1970s vintage vehicles there are few options for multi-fit roof racks. Most manufacturers fitment guides do not go that far back.
You will be best served by a universal fit rack, such as the Darby Turbo-Rack Universal Single-Bar Roof Rack, part # DTA968. This part is sold as a single bar, so for a typical installation you will need to order two of these.
The universal fit system uses a steel support bar that can telescope from 45 inches to 60 inches and foam pillars with a strap to... view full answer...