Good luck there Choo-Choo, parts out of Canada will cost you dearly in duties if and that is a big if Customs will allow firearm parts to be imported.
Dont waste your time, money and effort on the ChiCom knock offs.
All of the Chinese stuff that is cloned will have weird quirks to it such as oddball thread dimensions and odd dimensions when compared to the US Ithica. They retro engineer this stuff and I dont think they have the whole SAE to Metric conversion quite figured out. To try and adapt the Ithica parts will end up costing more than it is worth.