Used crankshaft timing gear.  This sits on the crankshaft and drives the oil pump. Fits the following:

97-12 LS1/LS6/LS2/LS3 Corvette (DOES NOT WORK WITH DRY SUMP LS3/LS7/LS9)
98-02 LS1 Camaro
98-02 LS1 Trans Am
04-07 LS6/LS2 CTS-V
04-06 LS1/LS2 GTO
99-04 LQ4/LQ9 Truck engines

The item in the picture is the actual photo of the item being sold.