AC Receptacle in a SL 500?

Does anyone have any ideas on how to plug in a 12V device into at (97) SL 500? I've got a few devices (e.g., satellite radio & cell phone power supplies) that I'd like to use. I never known the cigarette lighter receptacle to work with any of these larger-type plugs.

[spinedoc]

Ive got a delphi skyfi satellite radio that wouldnt fit in the teeny tiny lighter. What I did was find a female 12v auto receptacle at radio shack for like 2 bucks, plug the satellite power into it, splice the radio shack connector wires and wire them up to the back of the cigarette lighter. The entire lighter assembly should just come out if you take out the compartment, and both power and ground are there, easy to splice into them. Ive also got my remote SR7 radar det hooked on here, works great.

Other than that Im not sure there is a neat and clean solution.