A:Answer Hello Tina - All 30" over-the-range microwaves are approximately the same width, and are designed to fit into a 30" wide cabinet opening. Each microwave comes with the mounting hardware (mounting bracket, screws, exhaust adapter), top and rear templates, and installation instructions needed to make installation a simple process. This makes choosing a replacement microwave easy.
NOTE: When replacing an over-the-range microwave, the mounting bracket included with the new microwave should be used since the mounting bracket is specific to each model. The new screws, bolts, and exhaust adapter should also be used.
If you are replacing a 36" over-the-range microwave, many current 30" over-the-range microwaves offer an optional 36" filler kit to allow it to be installed in a 36" cut-out opening. If available, the filler kit will be listed in the product specifications.
We no longer manufacture any over-the-range microwaves in Bisque that have a 36 inch filler kit.
You may view our current line up of over-the-range models here: http://products.geappliances.com/appliance/gea-category/microwave-ovens?ascdesc=d&p=1&r=12&sortBy=price&Type=Over-the-Range&Color=Stainless+Steel&Color=Slate&Color=Black&Color=White&Venting+Type=External
-TREY@GEA