I don't know of an available trim kit for this oven. What I would do is put boards under the oven to provide a liftt base. Like; three 26 inch long 3x4s or 4x4s. You would need to measure space below oven. Then you could put a basic trim board to match you're cabinet underneath the oven. If you don't have a base inside the cabinet to put the base boards, you'd need the just cut a piece of wood to fill the bottom gap in your cutout. You would fasten the wood piece from behind using another board or bracket. The point of this, is to have the fill under the oven, so it's not noticeable. You can find a lot of random trim boards at Home Depot or Lowes in the cabinet area. Of course you can find everything else in the lumber section.