Welcome,
I might have a solution for you if you have no luck at Western Gun Parts.
I to was given a Squire-Bingham Bolt action M11, .22 a while ago and had a hell of a time trying to find Mags for it. I finally did find a couple of 5 shot mags from a friend, but then I came across a savage 10 round mag. at the location Canadian Tire Store in Kingston and it looked almost identical to the originals, just longer. A few minor modifications with a dremel to knotch it for the mag. catch and a little trimming and it worked fine! you may find some savage mags. at a local gun shop if your CTC does not carry them. in any case just a suggestion. PM me if you need more info.