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Even though it is a 9mm nut, if you don't have a 9mm wrench, you can pinch-hit with a 3/8-inch boxed or open wrench. If you have a wrench with an offset head, such as the one shown, that's even better. The nut only needs to be loosened, as the dash hole is slotted. The other two nuts can be easily removed with a 9mm socket.