Am in need of a water pump pulley for my 3.0L Mercruiser inboard. The pulley has three grooves with the two next to the engine block being 7 3/8 inches in diameter and the front (power steering) pulley being 4 3/4 inches in diameter. On my application, the center groove is not used. The measurements were taken at the pulleys widest point. If anyone knows where I may find one of these, preferably used, please let me know. Thanks.