The cable from the control unit in the dash reached the trunk, but just barely. The main unit would have to mount on the package shelf or the bulkhead. Since the package shelf would have forced the speakers close together, the bulkhead was chosen. The bulkhead has a bead rolled in it which would interfere with the unit. So I snagged the 3/4" square aluminum tubing from the failed attempt using it to mount the radiator and cut some short sections, drilled holes in them, and put in riv-nuts. I will need to work out the antenna, the remote control unit, and the speaker wires. But the big issue of getting a unit to fit the car is done.
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