Hello Seahawks12 and thank you for your question.
The Deluxe Built-In 30 inch Microwave Trim Kit Model # JX7230SFSS allows for built-in installation of a the 2.2 microwave oven in a wall or cabinet alone, or over a GE Profile Series 30 in. single electric wall oven: http://www.homedepot.com/p/GE-Delux...
The Installation Instructions are located here: https://www.myapstore.com/Marketing...
. Your opening measurements look good – double check that you have 19.5 or 22 inch depth.
I hope this new microwave carries on the re-heated pizza tradition as well as its predecessor!
Best wishes on your project.