easy enough to run a cable to the lock-box. Take out the lock box (two screws at the front) then pull up the wood console that has the window switches/gear selector. Run the cable from head unit down behind the ashtray then along inside the centre console next to the gear selector. Drill or cut a small hole big enough for the 3.5mm jack in the black plastic of the front of the lock box, and run the cable in. Put it all back together and it's totally hidden.

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1993 320TE M104
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past:

1983 230E W123 M102
1994 E300D S124 OM606 (x2)
1967 250SE W108 M129
1972 280se 3.5 W108 M116
1980 280SE W116 M110
1980 350SE W116 M116
1992 300E W124 M103
1994 E280 W124 M104
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"music and women I cannot but give way to, whatever my business" -Pepys