I have entered almost all of the Canadian stamps into my albums from 1851 up to 1995. I am using the "S" type strips (top opening) and the majority of the stamps fit into the following mounts (in mm):
21, 24, 26, 29, 31, 36, 41, 48.
One package of 21 and 48 will do all the stamps of those sizes, but I have used between 4 and 10 packages of all the other sizes. You will also need some 120 and 150 for souvenir sheets. See the link below for the mounts I am referring to. These mounts are measured by the stamp size, so a 24mm mount fits a 24mm tall stamp, etc. The Canadian stamps are quite random in width, so if you wanted the pre-cut width ones, you would need hundreds of different mount sizes.
http://www.arpinphilately.com/produ...k/index.html