AMG is certainly still alive. For the 129 SL, the only "real" one is the SL60, as far as I know. Among other things, it has AMG clearly written on the larger engine. (5956 cc V8, 381 HP), weighs a bit less than the SL500. I seem to remember an SL55, but perhaps that is just the new model.

Momo

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1990 500SL 65k km - until May 11 2004
2004 E320 4-Matic wagon
2004 CLK500 Cabrio from May 11 2004