A method of forming a mirror reflective element assembly includes providing front and rear substrates and establishing a curved recess at a second surface of the front substrate and establishing a mirror reflector coating at the curved recess. An uncured seal is dispensed on a dispensing surface and has a first gap between terminal ends of said seal. The uncured seal is dispensed substantially around a principal reflecting region and a spotter region and defines a second gap between spaced apart portions of the uncured seal at an outboard region of the spotter region. A portion of the uncured seal is dispensed across the spotter region. The first gap provides a fill port for said mirror reflective element assembly when the front and rear substrates are mated together, and the second gap provides a vent port for the spotter cavity when the front and rear substrates are mated together.