from bottom you get crank pulley, AC, water pump, altenator, tensioner pullley (this is the one i use the extension and socket on. you can buy a special tool for it), then idler pulley or power steering.

Im guessing the bearing is on the frits on your tensioner/idler pulleys. Ive never been a fan or aftermarket pulleys just becase they tend to fail quickly. OEM ftw imo