Cooktop cut out hole too big for new cooktop

Just removed what must be a 30 year old cooktop to replace it with a nice ceramic one. The hole in the kitchen tiles from the old cooktop is slightly larger than what I need. The hole should be 28 7/8 x 20 1/4 and it is 30 1/2. x 20 3/4. What can I do to make the hole smaller to accommodate the new cooktop?
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Doesn't sound like you have a large gap to fill, so one way might be to nail in 1/4" wood strips to the inside of the counter cutout and maybe frame the hold with some aluminum to give the cooktop a nice bezel around it.

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Some manufactures make larger trims,,,, special order.
Call a sheet metal fabricator and see what can be made. Get ready for a price......
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4ax.com:

Add some wood around the insid of the hole. Remove the first tiles around the existing hole and find some larger tiles and cut to fit. It may be difficult to find tiles that will match or complement such an old counter top, however.
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GoHabsGo wrote:

So don't try to match it. Find some contrast border tiles or something to make a nice effect. If possible, leave whole tiles in the existing stuff, and trim the new border tiles to fit. That way you won't have obvious partial tiles to stare at.
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