Try to match the brand, Perfecto and All-glass are the biggest, but they have slightly different dimensions. Glasscages.com will also sell you parts, I believe. I think replacing the trim would be best in the long run. The one-piece top trim keeps the piece of glass from spreading apart under the pressure of water. If you don't replace the trim, you need to do something to hold the side together or it will eventually leak. I don't know what though - rubber bands, wood collar?
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