No, it would require a major retrofit on you part to lower a self-levelling rear axle suspension on any M.B. The system is carefully set to act on weight and ride parameters and they are not resetable.

Also, in the U.S. there are a lot of "Gray Market" W126s imported directly from Europe in the late 70's and early 80's. Be careful about them, because in Europe and most world markets you could order ANY W126 fitted with a self-levelling rear axle (it was an extra cost option, but could be fitted to the 260SE, 300SE/L, 300SD/L, 380SEL, 420SE/L and 500SE/L - the 560SE/L was the only one who had the system fitted as standard).

Hence, some of this "Grey Market" models maybe fitted with self-levelling rear axles even if they are the lower models.

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A. Rosich
CL 500, 1998
S 500 L, 1998
E 320 T, 1995 [Sadly sold ]