Proflow's Billet belt tensioners with idler pulleys fit all GM LS passenger car engines, including LS1, 2, 3, 6, and 7 and feature a higher pulley sidewall so that your serpentine belt always stays in place. The belt tensioners feature lightweight 6061-T6 aluminium billet construction and are black anodised or polished to be attractive and functional additions to any LS passenger car engines. Suits VT-VZ water pump.