I put my AK-450 ELT behind the passenger seat, fwd of the flap arm. I attached it to a base plate and Z angles, then pull-riveted the angles to the seat floor. Im mounting the antenna on the back side the aft center flap brace. The remote cable goes down through the seat floor (through a grommet), then forward under the seat to the spar, then through spar with my other wires.
I made some Z brackets for my strobe power supply and riveted it to the bottom skin behind the baggage wall, pilot side, about 6 inches behind the bulkhead.
Jekyll
7A