Evap Fan Motor Replacement Components (501R,501F)
  501R    Use Regardless of Serial Number.
  501F    Prior to #M/P1004775 Except Between
          #M960170-M960319 And #M996400-M996574.
          Starting With #M/P1004775 And Between
          #M960170-M960319 And #M996400-M996574
          See 4201770