In the gun industry, we have to remember the Canada is a very small market and we have to deal with those kind of problem.
The best part you can find for a 1911 are over size for a better fitting. If your looking for a standard interchangeable part maybe the 1911 is not the platform you need.
Like Travis Haley says on the Magpul pistol DvD , 1911 is like a Formula 1 , but need to be perfectly tuned.
My advise is sale this .22 kit and buy a Chiappa 1911 at 350$. I run the Ar15 upper in .22 shoot like hell !
Good luck.