Used GM automatic accessory belt tensioner. This is for the alternator/water pump/power steering pump/balancer belt only, and mounts on the water pump. Fits the following:
98-02 V8 LS1 Camaro Z28, SS
98-02 V8 LS1 Firebird/Trans Am
04-06 LS1/LS2 GTO
NOTE : This does not fit Corvette nor Trucks!