This is a New Aftermarket Crankshaft Pulley for the Buick, Pontiac, Oldsmobile with the 231 , 6 Cylinder 3.8L Engine.  
  
    Contents : 1 - Pulley
      
    Part #  25522581 , 1235821

    Item Description : New 231 Buick Pontiac Oldsmobile Pulley 1982-1987

   Information : 3-Groove Pulley

                         1st groove - 6 5/8" (outside) 

                         2nd groove - 6 5/8" (middle)

                         3rd groove - 5 3/4" (inside)