So, a quick google ( I was thinking Wolf Springs) I found this bit of info.
https://pacifictoolandgauge.com/remington-40x-rimfire-firing-springs/1000-40x-rim-fire-spring.html
Problem (maybe, maybe not) they are in Oregon and I didnt bother to read all of their shipping policies.
So, maybe an email to them and ask if there are any issues selling to a Canadian or call Reliable and ask if they have a Wolf Spring for your Remington 40X.
Western Gun Parts in Edmonton is another source, but make sure you have the serial number and of course the make and model number handy.
The one gal can be kinda fussy

Rob