Its important to note that on first generation w126's you'll need to install a door lock actuator on the driver side door as there is no vacuum supply. I had to do this on my one 300SD.

The 201 has a Directed Electronics unit, works well, its tucked under the the back seat.

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82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
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91 300D 2.5 Turbo. 241k
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93 300E 195k