Dear cousin had this issue and found that CW had them but were pricey. Surely there is something close at WM or other and you might be able to modify the trim piece with a wooden molding stained to match your cabinets to make it work. Some manufacturers offer trim pieces for their specific models in the instruction manual. Our micro at home is built in and DH was going to make an oak one to match the cabinets - he's a really good woodworker - until we spotted this one that all he had to do was screw it in place.