A mirror support assembly for a motor vehicle comprising an upper support arm, an upper mounting element for mounting the upper support arms to the vehicle, a lower support arm, and a lower mounting element for mounting the lower support arm to the vehicle. A mirror head brace for uniting the upper and lower support arms includes a cast structural member made by pressure casting. The mirror head brace includes at least one longitudinal groove which determines a defined angular setting between the mirror head brace and the upper and lower support arms. The plurality of scorings functionally determine different angular settings relative to the mirror support arms of a mirror head 12 which is carried by mirror head brace.