Used (non-branded) timing set.  This is a machined steel cam gear adjustable by dowel.  This is for 24x systems and a 3-bolt cam.  This came off a motor that came into the shop to be stroked, which we installed a new timing set.  This fits under stock timing cover (most applications). Fits the following:

97-05 LS1/LS2/LS6 engines (24x crank sensor)

97-05 LS1/LS6 Corvette
98-04 LS1 Camaro & Trans Am

NOTE : LS motors come in 2 reluctor styles, 24x and 58x.  24x is identified with a black crank sensor, 58x is identified with a gray crank sensor.  You cannot mix the timing sets with a different crank ring style!