Can anyone please tell me where I can buy the Height Control Module for my GL450 on 2007 Mercedes-Benz GL450

I did a diagnostic test on my GL450 and was told the Height Control Module is faulty because my car sinks at the left rear shocks when I park and rises when I start which had also happened to the front shocks before.

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1 answer
i think that is dealer item only or go good used from wrecking yard