Send gunrunner100 a pm and ask him to stick hizz mitt into the magic black hat.
Never know what might come out of there.
A WTB in the EE?
WGP's?
Numerich?
Brownells?
Gun shows?
The gun newspaper way up north with a WTB ad?
Maybe you own the part's gun...
Have you tried Numrich Gun parts?They have a Website that lists parts available for the older Mossbergs etc.Some restrictions of course but there are some parts they can ship to Canada.