Used water pump drive coupler for all LT1 engines.  This coupler connects the cam-driven drive unit to the water pump.  Fits the following:

92-96 LT1/LT4 Corvette
93-97 LT1 Camaro Z28
93-97 LT1 Firebird Formula, Trans Am, WS6
94-96 LT1 Impala SS, Caprice, Roadmaster

The item in the photo is the exact item being sold.