I'd vote on the ball joint or maybe the idler arm bushing if on the passenger side.

A ball joint that squeeks will throw noise all over the suspension and they are hard to prove. They will usually have broken boots on ones that squeek.

The ball joints are replacable on all 124 body cars and are item #15 in the above drawing. If you asked any of the guys who do it in our shop they would say they are a piece of cake. We don't even remove the control arm from the car.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician