I am very bow legged also. I built my own. To find your shim angle buy some plastic door shims for pretty cheap at Menards, Home Depot, etc. Drill screw holes in them matching the binding plate holes. Mount up the shims perpendicular to the bindings to try them out. You will need slightly longer screws on the thicker sides. I ended up at 1/4" thickness. From there I bought some 1/4" starboard. Could have used 1/4" plastic cutting board also at Walmart, etc. I then traced my boot shapes out on the plastic with a yellow crayon, cut the shape, then ground the angle on a sanding table. Lastly, I drilled the boot holes and mounted them up between the plates and the boots. Works great for me.