2003 Chevy Silverado lists two different size plugs or adapters on the heater core, unfortunately Revain only reports that. Please check the gate or doorman website for two applications. You can tell which one to buy by the size of the parting tool used to remove the original. If you're using the white tool, you don't need this part. If you use the green tool, you need it as a part. I learned it the hard way.
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