Rear lower control arms on 126 cars are a bunch of money new. In my area the only reason one would ever replace control arms would be after an accident, but I have seen them rust out.

They should be readily available used for a fifth of new price. I got a whoe yard full of them unless you have the aluminum arms used with hydraulic suspension.

Replacement is just work.

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