Hi Gordon. Welcome to our little corner of the 'net.
No idea where you could find one.. certainly not Canadian Tire. They are usually less than helpful in this area. They are all very similar. I just did a google on "mastercraft snowblowers" and it appears a lot of them were built by Gilson Brothers, which was purchased by Lawn-Boy. You "might" be able to get some information from them.
If you can't, you can always buy a router and take up woodworking this winter.
They say marriages are made in heaven.... but so is thunder and lightning.