fwiw, I bought a 500SEL awhile back that someone had put a gen2 interior in- none of the seats moved like they should. Only certain sections of the seat would move and only when pressing the wrong part of the switch. I rewired the pins on the plug for the drivers seat using the wiring diagrams for both cars and made myself a 1ft long "harness" to connect the plug on the body to the passenger seat motor plugs directly- I removed the seat module since the seats were powered through the switch. Everything worked great when it was done.

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350