this never happened to my 124, but my 190e used to squeak too. i just sprayed silicon lubricant on the plastic thingy(it has a small ball joint) connecting the rear stabilizer to the rear lower control arm.

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85 190E 2.3(SOLD)
86 230E (-->300D) sold
87 300D (-->300TD) sold
68 250S w/ a 615 and manual tranny (RIP)
87 300TD (SOLD)
95 S280 "The KRAKEN" (Turbo 2.9 602 transplant) traded
86 190E 2.3... current project