I guess MBZ figured us 240 drivers would be smart enough to always stay over to the extreme right side of the road anyhow and not need a mirror on that side.

Seriously, I know where one is I think, are they hard to install?

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You're a daisy if you do.
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84 Euro 240D 4spd. 220.5k sold
04 Honda Element AWD
1985 F150 XLT 4x4, 351W with 270k miles, hay hauler
1997 Suzuki Sidekick 4x4
1993 Toyota 4wd Pickup 226K and counting

Mercedes passenger-side mirrors were optional for many years. The cars do look a bit unbalanced without one.
Many years ago, I paid $80 for a new passenger mirror from Mercedes for my '72 250 sedan. They were an extremely rare option on those cars, and almost impossible to find in salvage-yards. Fortunately, the W123 mirrors are much more common.
I added passenger-mirrors on my first '82 240D and my recently-sold '81 240D. Paid $50 for the first one at Potomac German Auto, and $25 for the second from a Forum member.
It's pretty easy to add a manual mirror, though if you need to pull one at a salvage-yard, removing the little plastic adjuster-knob is a bit tricky. And the little molded-plastic nubs that hold the chrome-plastic inside mirror plate to the door may be weak or broken, so you may need to add some double-sided foam-tape or a dab of glue there.
My latest 240D came with the manual passenger-mirror and my Euro 300TD came with a power-operated passenger-mirror.

Happy Motoring, Mark

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DrDKW

drilling involved or not? The car isn't here right now for me to look at but I'm thinking maybe it's just removing some trim that's there or something? I found a federal 123 at our local yard, remember it had both mirrors but didn't really pay attention to condition, I'm going to stop by there today and look at it...

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You're a daisy if you do.
__________________________________
84 Euro 240D 4spd. 220.5k sold
04 Honda Element AWD
1985 F150 XLT 4x4, 351W with 270k miles, hay hauler
1997 Suzuki Sidekick 4x4
1993 Toyota 4wd Pickup 226K and counting

There's no drilling involved in a 123. Simply remove the trim and the mirror bolts right in. In right hand drive markets it was the (US passenger side) door that had the drivers mirror in it and the left side of the car went without. Simply find the right side mirror on ebay, junkyard or wherever and install it. I did that with my 240D as soon as I could source a right side mirror.

- Peter.

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2021 Chevrolet Spark
Formerly...
2000 GMC Sonoma
1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021
2002 Kia Rio. Worst crap on four wheels
1981 240D 4spd stick. 389000 miles.
1984 123 200
1979 116 280S
1972 Cadillac Sedan DeVille
1971 108 280S

Look at link in post 11 for a nice picture that answers your question....

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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John

^ I doubt it, remove the cover, a hole should be there. As mentioned those were optional, so I don't think MB would have two different passenger doors on the assembly line

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83 SD

84 CD