Replaced existing PEB2060SM2SS microwave to match our new SS Profile wall oven. New PES7227 is same size as existing microwave. Needed to “wall mount” over the main oven. 
GE does NOT make a trim kit for t.he PES7227 series. However, I was sure I’d be able to use my existing kit. And yes I did! Only mod needed to existing trim kit was where the new PES microwave feet mated to the kit. Perfect fit. More than adequate ventilation.