Ok, so the head unit should be plug and play, more or less.

Been checking out the EPC to see how the radio was hooked up in the 99 210 car it came out of...

The amp used with this HU, according to the EPC is part number A210 820 26 89

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'90 300SE 298k
-300K and it gets put into retirement.
'80 300D 255k Purchased new by family in 1980.

Had a:
1973 220 (gas)
1980 300SD
1992 400E