New GM bolt set.  This particular listing is for the front timing cover hardware.  This includes (8) bolts to attach the timing cover to the engine block (13mm head), (1) bolt to attach the cam sensor to the timing cover (for GEN IV block covers) and (1) bolt to attach the sensor harness to the cover (for GEN IV block covers).  Gen III blocks will not use the 2 small bolts.  Fits all LS based engines with conventional oiling (aka Wet Sump). Fits the following:

97-10 LS1/LS6/LS2/LS3 Corvette
98-02 LS1 Camaro & Firebird
04-06 LS1/LS2 GTO
04-07 LS6/LS2 CTS-V
99-10 Vortec Trucks