This is a Mitsubishi Alternator for 1999-01 Chevrolet Tracker and Suzuki Vitara With the 1.6L Engine. This Unit Has a 4-Groove Pulley, a Single Bottom Mounting Foot (Wide) and an Extension Off the Battery Stud at 1:00. The Plug ("D-IG-L") is Oval (Located at 2:00). The 13781 is Virtually the Same Unit, in a 70A Version (Used on the Same Vehicles With the 2.0L Engine), Except the 13781 Uses a 5-Groove Pulley. The 13780D is a Denso Version Used on Similar Cars in Europe. The 13780 and 13780D Interchange.