I did all the suspension bushings in the rear of my 1978 300D, back in 2012 and as a one-person job, in a driveway, during the fall in the New Mexico high desert, it was a royal PITA, but it made the car drive so much better. Swapping in "new" control arms would not be any harder and you could take care of all the rubber back there while you're at it.
Phil Forrest

__________________
1972 220D "Trudy," named by a friend.

"The 220D sounds good... I suspect it is the only car that you need a calendar for, rather than a stopwatch, when doing acceleration tests."
Tom Abrahamsson