OEM pulley on your Genetator bent or cracked? Well, here's our new CNC machined pulley for the 5/8" wide belt. This pulley has a .670 bore to fit the mainshaft of all Delco Generators or Alternators. A nice heavy duty pulley priced right! Don't take a chance with an old bent or cracked pulley. Go with a new pulley from B&B!