To answer my own post, I did find a perfect spot for the box. It was, as the others said, under the passenger carpet. On my car, there is a sheet metal shield panel which is located under the carpet, not on the floor but on the angled-up portion of the footwell. This panel has a warning sticker about disconnecting a red connector related to the airbag. One screw removes that panel. Undo the screw and lift the top part of the panel and a clip slides out. Easy.

Under the panel is some sort of electronic box with Becker on it - presumably something for the radio (?) mounted on a sheet metal base and a red connector which is presumably the one referred to on the warning sticker. Anyway, the sheet metal panel there has plenty of room for the Sirius box and several holes already drilled. I used one of the holes in it by opening it up slightly, drilled one more hole, and it's a perfect mount for the box. Now the challenge of running the antenna cable!

Rgds,
Chris W.
'95 E300D

I know this post is getting a little stale but...

I too have a 95 E300D and am planning out my install now. How did you run the antenna cable? Out the trunk?

I ran my cable through the center console, under the left floor mat, out the back door, up to the rear window pillar (there is an external panel that is detachable by the rear door on either side of the car), then under the rear window gasket. From there around the gasket to the top of the rear window, centered. This approach isn't perfect but means I didn't have to drill any holes.

wow that was a fast reply! Thanks!

I hope it made sense...I can take a picture of how I routed the wire if that helps.

I'm in the process of ditching my XM radio (the add on type with the modulator) and buying the Kenwood unit with built in Sirius and HD radio.

Probably the same Kenwood I'm planning on buying - the EZ500. It looks like it should be in a Benz - very understated. I've been told there will be a Blue-tooth add-on for that radio as well in March (for phones). That will make a nice setup.

If you have a picture to send, I'd love to look at it. I'm making my purchase this weekend so I'm ready to install by the end of next week

Yeah, that is the one. Great features at a reasonable price and no add on boxes. But here's the question, does your e300d have the active base system that powers small "subs" in the doors? If so there is a small amp in the trunk on the right. I wonder how to connect those speakers when adding the new amp. I pulled up the service manuals and found information about the amp. Apparently it is powered on when the antenna goes up. So when installing the new head unit, I will need to figure out which wires are "line out" and which controls the antenna.

I will post some pics of how I ran the antenna. Could you post pics of the wire harness and plugs on the back of the stock radio....actually how do you plan to connect your radio? Is there a wire harness adapter available.