This is a NOS (new old stock) Motorcraft Ford Voltage Regulator.  Part number D4TZ-10316-A.  Fits from 1965 to 1967 Mustang, Torino, Cougar and Shelby.  The voltage regulator comes in the original Ford box.  It has never been used.  Electronic parts and components are not eligible for returns.  Please look at the pictures closely, check part number, do your homework and ask questions before purchasing.