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Update Looks like the new water pumps come with a gasket and O ring for the thermostat. The sepentine I bought is the Dayco 5060930 for the 130 amp alternator. Job went smooth.

Hello all, I have a coolant leak and plan to replace my water pump. I have been researching water pumps and found that two different types/models are recommended for my Tahoe. The difference in models is the size of thermostat it connects to, either a 1.88 or 2.05 diameter thermostat. Which...