As you can see there are TWO three groove water pump pulleys available from OPGI. The one on second row is wrong part number and looks exactly like one I had originally. The one on top row looks more like what I need. It has a shorter Top. Weirdly they do not like a GM part number. I ordered that one. When it came it did NOT look like what I ordered and instead looks like the one on second row. Ok. Now compare to this...