I would recommend U.S. Vietnam War era figures. The uniforms are very similar to Canadian Combats with the exception of the pockets on the shirts and pants...easy enough to re-shape with puttty. The webbing is not too dissimilar either.
Whether it is Verlinden, Hobby Fan, Bravo 6 or a host of other figure producers there are many great starting points.
I converted both Hobby Fan and Verlinden Vietnam era figures to mid 1980s Canadian Infantry without issues.