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Try an auto recycler or Fred Beans if you want a new one. The pully cannot be attached or you cannot mount the pump. You mount the pump to alternator bracket then attach the pully
if you buy one of the aftermarket ones offered in the forum store you can attach the pulley to the pump then bolt it into the bracket because the pulley is spoked! plus it looks cool
Yes, buy a Turn One PS pump. They are great, and I had one on my Firebird with the LS1. They will safety wire the pulley on and they make really nice billet units that have slots so you can get the bolts on and off without removing the pulley. They are also less than new GM pumps.
Turn One does offer the Corvette Pump and pulley. They are different from the firebird. You can also buy the Turn One Corvette pumps through Lingenfelter if you want.
You don't have to take the pulley off to remove the pump, but it makes it much easier.
FYI - If your pump is not destroyed you can send your pump to Turn One for a reliable rebuild.