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I'm always looking for Canadian parts sources, but they all seem to come up short.
Have you tried iapcanada.com ? Sometimes finding things can be a bit tricky as they may call a part by a name that differs from what you have submitted in the search box. If you think they should have a (enter part name here) they probably do. Part numbers help.
Curiously, the parts invariably come from Florida but you will not pay duty.
Have you tried this lifetime guarantee thing yourself? Seems too good to be true that I can buy brake pads, wear them out, then send them back and get new ones free...for life?
There are lots of customer testimonials on their site about it, and they are explicit that this return policy is one of their key differentiators. There are also independent YouTube vids talking about it too - even for oil changes. Give them a shout if you have questions.