Anyone know the part# to the idler pulley next to the Supercharger pulley?

I just see pulleys for a/c, water pump, and power steering. Are all accessory drive idler pulleys the same on the Previa?

How do I change them? Do I just take the locknut off the face and pull off the pulley by hand? Or do I also need to pull the adjustment bolt out also?

97 Previa S/C DX RWD