Definitely a cup holder. (Seems to be a common complaint) Driving it while holding my coffee was fine when it was an automatic, but with a stick, things can get a little awkward.

Variable intermittent wipers. I know it's another common complaint, and I know I can probably still get the upgraded module from a forum member, but more important things seem to keep making use of my adjustable intermittent wiper upgrade funds.

A place to mount speakers that doesn't suck. As an audiophile, the sound system options in a W123 are just intolerable. Seriously... They had a team of engineers for everything on the W123, and somehow neglected to consider putting a sound system in that could even hold a candle to the craptastic single speaker AM/FM Delco tuners that they were putting in GMC work trucks of the same era. I have a little 8" low-profile JBL subwoofer from a Honda CRV that I'm going to attempt installing in the med kit hole at some point to add a modest amount of bottom end to the sound system, but the staging will always suck terribly for as long as I am trying to use 4" dash speakers that point at the freaking windshield. It's just a horrible car for anyone that cares about audio quality.

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- K.C.Adams

'77 300D Euro Delivery
OM617 turbo / 4-speed swap
404 Milanbraun Metallic / 134 Dattel MB-Tex

Current status:
* Undergoing body work

My '77 300D progress thread