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antp
The changeover from 5 to LeCar in Canada was in 1979:
https://www.ebay.com/itm/263767171214
https://i.pinimg.com/originals/9c/68/2f/9c682f965d3f380afaa09d80936ec725.jpg
Indeed that second image is from a Canadian magazine, but have you searched/found more evidence? Was that change consistent/permanent or did they use both names after that?