We replaced a built in microwave in the same "hole" used the same trim kit MK2167 - the store could not tell me which kit would fit, so I decided to wait and see it the old one would work. Since it is installed I can only give you the width 21 5/8", the height 11 3/4 " . The depth from the INSIDE back to the outside front looks to be 16". I can't remember the model number of the old microwave since I threw away the booklet, but it is identical to this one. I hope this helps.