I have looked into it briefly and not found anything. There are some HID like round lights available to replace the sealed beams, but they are more of a standard reflector that has a fake lens in it. Some BMWs had round HIDs, but they are smaller in diameter.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine