I looked at Pelicans listing of regulators for your car, and they show only front regulators. Usually they have the rear too and show an aftermarket brand...way cheaper than the MB brand.... called something like Magneti Morelli and fortunately for you, the rear regulator usually come with the motor and the fronts do not. Where have you looked?

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'89 260e (212K Mi.), '92 400e (208K Mi.), '92 400e (not a misprint) (146K Mi.), '95 C220, '81 240D--Sold