I know a guy here in BC who specializes in older Mini's!
Give Cedar Valley Alignment a call. They may not have any website to share, but they do Mini's. They might know where to start to look for parts in Canada. Ask for Nolan
Cedar Valley Alignment
Auto Repair Shop
Address: 7082 Mershon St, Mission, BC V2V 2Y7
Phone: (604) 826-3444
Province: British Columbia
Hope this helps!
Josh