Part Type: Engine Coolant Thermostat O-Ring. 2001 GMC Sierra 3500 Engine: 8.1L V8;. 2002 GMC Sierra 3500 Engine: 8.1L V8;. 2003 GMC Sierra 3500 Engine: 8.1L V8;. 2004 GMC Sierra 3500 Engine: 8.1L V8;.
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