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There are some L shaped metal fillers you can get to fill 3” gap in each side. GE makes a few of them to match the oven finish or no name “universal” that do the same thing. The other option is to fill the gap by installing a custom built wood pieces. Either way, options are available but I think the best option is to get the right size oven for the opening; it would look better and easier installation without spending extra $$$.
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