assuming you still have a storage box under the center seat like in the old series 3 my dad had when I was a kid, bit of plywood and stick whatever you want in there, hidden from view.
if it's an old analogue radio you put in there like scotty gave a link for, all you need is an on/off switch somewhere on the dash and once the radio is tuned in to the station you want, it's just a case of turning it on/off from the switch on your dash.
or you could do the same thing and mount it behind the center seat
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