Comparison of how the belts compare on the water pump pulley. The belt on the left is a gates 7570/11A1450. On the center and right is the Dayco 15570/11A1450. The "11" in the part number is supposed to indicate 11mm wide. A 10mm wrench goes over the Gates belt but not the Dayco. BTW I don't believe it would be a good idea to mix these types on the same engine.
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