Totally agree. That's why I want to keep the Becker in the SDL.

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1986 300SDL - 116K
2014 Prius Plug-in (company car)
2014 Q5 TDI (wife's car)

The 1990 Becker radios are an easy fit into the older cars and have better power / sound than the early 80s ones.

So something like this would work (from a 91, I believe)?

Factory Mercedes Benz 1991 300E Grand Prix Be 1480 Becker Radio Cassette | eBay

This vendor sells refurb units that have auxiliary inputs...that would solve my problem.

Refurbished Mercedes Becker Radio Be 1480 w Aux Input | eBay

I think the latest model 126 sedans had more speakers than my 86 SDL has, though (in the doors, for example). I'm not sure if that would make a difference or not.

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1986 300SDL - 116K
2014 Prius Plug-in (company car)
2014 Q5 TDI (wife's car)

i have used this in our Subaru with the MacIntosh Stereo. works very well and you don't have to worry about interference like with the wireless models:
Amazon.com: Scosche FM-MOD02 Universal Audio Input FM Modulator for iPod, Satellite Radio or Portable Music Player: MP3 Players & Accessories

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1983 300SD (daily driver)
1991 420SEL (work in progress)
1979 300SD (future replacement for 83 SD)

RIP:
1983 300SD (totalled)
1986 420SEL

Hmm... Wonder what happened to put a Blaupunkt radio + casette in Grampy's '82 300SD? I'd be surprised if he decided to change it himself. Then again, he might have preferred the "old fashioned" knobs and face to the buttons and digital display pictured previously.