Jon's great post on Trans-Am engine compartments inspired this note. The pics I've attached show a water pump pulley that looks awfully similar to the item in this DANA Camaro engine pic.
I post these three separately attached pulley detail pictures because it shows that this particular 3906656 pulley is more than just a short water pump, factory high-performance (Corvette and others), deep groove affair. The pulley has been fully TIG/Heli-Arc welded along the backside to join the two pieces of metal that aren't held together normally. This would help keep the pulley from cracking in this previously unsupported area. This pulley is also a good choice because the mounting surface where this bolts up to the water pump is already a sandwich of two pieces of steel.