A mirror reflective element sub-assembly suitable for use for an exterior rearview mirror assembly of a vehicle includes a mirror reflective element, a mirror back plate, and a blind zone indication module. The blind zone indication module attaches at the rear side of the mirror reflective element via an aperture of the mirror back plate. The blind zone indication module includes a housing that houses a circuit element and at least one light emitting diode therein. The rear side of the mirror back plate includes structure at the indicator receiving portion that at least partially receives the housing. The circuit element includes electrically conductive terminals that are in electrical connection with circuitry of the circuit element and that are disposed at a connector portion of the housing that is configured to connect to a wire harness of an exterior rearview mirror assembly.