The wrench is flat and wide and was designed to hold a tensioner pulley in place while the retaining nut is applied. The retaining-nut usually over hangs its base therefore the wrench has to be flat. No conventionally sold metric key-wrench will clear the base for the retaining-nut installation. Do not look for something else. It was tried before you. It just will not clear. Two types of tensioner pulleys are used in 924-944 today. The metal tensioner pulley and the plastic tentioner pulley.