This is the complete tensioner assy with pulley. Fits 2002-2010 Duramax including LB7, LLY, LBZ, and LMM. Does not fit 2001 LB7. Genuine GM/AC Delco parts.

"I find that the bearings are getting pretty dry feeling in the 90,000 mile range. This is a good time to do both idlers, tensioner, and belt. Replace before they fail." -JK