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A: You have the wrong product. You need the GCT-4S-52 This will trim down to 19 x 19
A: The smaller slots are 8 inches.
A: the slots are 8" for the shorter ones.
A: Product Depth (in.) 21.25 in Product Width (in.) 14.25 in Product Height (in.) 2.38 in Adjustable Fit 11.625 in W x 17.75 in D