A speaker enclosure mounted within an internal wall of a vehicle may employ first and second enclosure halves that are vibration welded together to define an enclosure or cavity between the halves. A first leg and a second leg protrude from a bottom of the second half. The legs may have strengthening ribs to govern leg deflection resistance and further each have a resilient s-shaped tab protruding from the distal end of each leg to contact the wall of the vehicle. A first and a second fastener leg may each define a fastener hole and accept a fastener to help secure the speaker enclosure along with the first and second resilient legs. The fastener legs each may protrude from an enclosure half.