They're all discontinued, but they came on the UZ motors. IF you can source them you're looking at about 1,200 to 1,500 dollars just for the blower... really hard to find.
Could be found on the ES300's, Camrys, Solaras, etc.
BTW, the stock pulley on the TRD superchargers only made 4psi. However, you can buy an 8psi pulley but anything more than 6-7psi and you'll start running into detonation problems because of a hot charge.