67 barracuda heater box.

As far as i know... The only difference in a 67 heat only case is routing of one control cable. The controller changed in 68 through 72 models. It's levers dont travel quite as far so one cable attach at case had to be changed a little. Most would never notice the 1/4 inch difference in the slot of dash bezels. Anyway... The 67 controller will attach and work with 68 up heater case.
Good thing too since the controllers are not interchangeable.