Product Description: Cummins Control Parts List#'s (CPL): 1839, 2001, 2195 & 2304. Serial & CPL#'s Are Found On A Tag Located On The Side Of The Timing Gear Housing And/Or ValveCover. If Tag Is Missing, Check The Top Of The Oil Cooler Housing To See If It Is Stamped There. Serial Number Consist Of 8 Digits.CPL#'s Are 3 Or 4 Digits. Used In Automotive Applications.