I want the oem unit or 100% compatible. I assume the big plug that looks like a computer com port in the back is where it plugs in. I love the becker head unit and I would hate to have to install a non-compatible or new unit

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My Daily : 96 E-300 Diesel with 195,000 miles
Retired: 92 300D 2.5 T 345K miles and for sale
Retired: 95 E320 157K miles and currently parked with blown engine

Both retired cars are for sale as is my w124 shop inventory