Command will fit in the 129 SL (at least it can be made to fit), but it will look way out of place (due to relocated switches either to the compartment panel or the part of wood between armrest and shifter).

APS30 (OEM MB European GPS unit...made by Blaupunkt) is a way better (1-DIN sized) solution, but I don't know if US CDs are available for it.

GREETINGZ,

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1990 300SL-24
1993 C250D with a minor 600+k kilometer
www.MBenzNL.com(the Netherlands)