Autodim + compass + homelink mirror (check out 2phast.com). No exposed wires.
Link 1. Link 2. Also, the dome light contains a map light - unit is from a later model but my car came with it when I got it in 2004.
Extended armrest.
Convex lens passenger mirror. Original on mine came with flat lens. This is from an '84 or '85 W123 300D, direct fit for electric adjust mirror.
Since I installed Bosch Euro lights w/ vacuum leveler, this is where I placed the lever in place of the factory fader switch, which I opted to remove/bypass since I'm using an aftermarket stereo. The switches look similar - they are dial switches - so the leveler switch looked the part. I can raise/lower the main beam accordingly while driving.
15 x 7 Centra bundts, not the factory originals (those are harder to find).
Factory oil pan
skid plate.
Added clear
filters into the vacuum lines, in order to have a "window" into the system. If the shutoff solenoid goes bad oil leaks into the vacuum system (by way of vacuum sucking it out). The filters allow you to see this before they accumulate a large enough volume to flood the rest of the system.
Cocomats and
Gloria fire extinguisher. Obtained from a member based in Poland years ago (group buy). It's only a 1.0 Kg unit. The bracket is hard to find for a W123.
You already know about the extended armrest. If you look at the rocker panel, the jack access holes have plugs. These plugs or covers are from a 201 part number and fit perfectly into the W123 holes. The seat nets were fixed by using a simply bungee cord the right size (and color).
Here's also what I had
Andrew do to my key. Highly recommended!