I'm not sure about the pulley. I'd call Paxton and order an assembly manual for the blower setup. I bought a used blower before and it was missing a few of the pieces to complete the setup. The few pieces cost $700
. Just make sure you know everything before purchasing. You could also buy a brand new vortech A-trim for about $1700-1800. If you do get the blower you're going to need forged pistons.