I don't remember this as a Canadian application but it's possible it could've been from one of our '69 Acadians or some other Canadian unit of the era?.
Sometimes Holden or other GM branded products marketed in places like Oz, S. Africa and Venezuela etc used exact or similar trim parts...often for years later than we did too..
And Verne, wasn't there Canadian car W-motor valve covers w/ the word Pontiac embossed into them too?.
~ Pete