just FYI the radio you're looking for is a 1st Gen Becker 612. it has all the buttons flush mounted. the 1st and 2nd Gen Becker 612 faceplates will interchange on any Becker 612 chassis

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1983 300SD (daily driver)
1991 420SEL (work in progress)
1979 300SD (future replacement for 83 SD)

RIP:
1983 300SD (totalled)
1986 420SEL