The closest RV microwave we carry to match the dimensions of your Samsung MR1032UBC microwave is the Greystone Standard RV Microwave w/ Trim Kit # 324-000105. The trim kit will cover the width of your your opening but will not completely cover the 17" height. What you can do to solve that is to cut down a piece of wood to 3" by the length of your cutout hole and stain it to match your cabinets. You can use a pocket hole jig from your local hardware store and a few screws to mount the board... view full answer...