shoulder belts in a 71?

Hey I need some help with this one, maybe from the guys up north. My 71 Scamp had no shoulder belts up front when I got it. Off of the vin I found it was built in Canada 1970.
One the web I read shoulder belts were not required till '74 in Canada and were an option for some cars before that. I also read that some hardtops, convertibles and trucks were also exempt for some time. I also understand most cars built in the USA were equipped with them since 68. I added belts in the back for my two kids but I still have no belt in the middle up front either. Do you guys know if the car came equipped with them and got removed or if the were truly still an option in Canada at the time of manufacturing? I assume my headliner has been redone and it does feel as if the mounting hardware is behind the liner. Thanks for any input.