This is a NOS Ford vintage backup lamp gasket which is correct for all 1965 and 1966 Mustangs equipped with backup lamps.   It is correct for the LH or drivers side.    Comes in the original Ford package.   The white you see on the gasket is just the original molding release agent which Ford coated the mold with and rubs right off.  This gasket will fit, look and function just as Ford intended because it is original Ford.   No crappy import stuff here!