Although securing a replacement part might be difficult / impossible if you had a caliper to take measurements it be very easy to model and 3D print a replacement. It may take a couple of trials to get the angle/slope of the back facing of the leg but there's things you can do to mitigate. Biggest issue I see would be getting the print material to match the color of the rest of the plastic but at least it would be functional. You would have to basically eye a white paint mixture that matched, unless someone has already figured the right paint brand/mix ratios to get a match,