The 126 front end contains some non conventional nomenclature. My first guess from the complaint is what I call the caster joints, sometimes refered to as rear lower ball joints, sometimes refered to as longitudinal strut pivots. The problem is that the lower control arm on these cars is a concept composed of numerous pieces.

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