This product fits only Universal Mount Type J. It does not fit Universal Mount Type A, Universal Mount Type B, Universal Mount Type C, Universal Mount Type 6, Original Universal Mount, Universal Mount 2.0, Universal Mount Type β, Global Standard Mount, North American Universal Mount, South American Universal Mount, North African Standard Mount, Sub-Saharan African Universal Mount, Asian Standard Mount, South Asian Universal Mount, Australian Standard Mount, Pacific Islands Universal Mount, European Standard Mount, United Kingdom Standard Universal Mount, United Kingdom Universal Standard Mount, Welsh Universal Mount, Marshall Islands Universal Bayonet Mount, Marshall Islands Universal Screw Mount, or Universal Mount Classic. If you purchased this product expecting to install it in one of those mounts, please return it to the place of purchase and tell the clerk you were an idiot.