Below is the response I received from the company. These are NOT 3.5" x 3.5" caps. 3 and 5/8 inches is 3.625 inches, which is 1/8 inch over 3.50 inches (3 5/8 vs 3 1/2). They fit 3 1/2 rack (3.5") with an additional 1/8" to accommodate rack anomalies (imperfections). An eighth of an inch (1/8 inch) extra buffer per size equals 1/16 inch per defective side, just as designed. This makes them suitable for a 3.5" rack.
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