This Unit Mounts Like the Earlier Used 8292, But Has a Different Regulator -the Plug is 2-Pin, Rather Than 4-Pin. This Unit Uses "Regulated Voltage Control (RVC)" û GMÆs patented RVC technology optimizes alternator load by reducing voltage when the battery reaches 80 percent state-of-charge. RVC extends battery and electrical component life. This Unit Uses a Conventional 6-Groove Pulley. The 160A Bosch Version of This Unit is the 11075. In 12/2008 It Was Reported That OE #15263859 is Actually a 4-Pin Regulator, and if This is the Case, It Would Probably Be an 8292.