Or . . . . you can do it the easy way and go to a auto radio shop and pay $100 to have them install everything for you. LOL. BTW, what radio/model are you installing, with what accessories (i.e., CD player, CD Changer, tape deck, DVD Player?)

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1983 300D, the "Avocado"
1976 240D, 4-spd the "Pumpkin", SOLD to Pierre
1984 190D, 2.2L, 5-spd, my intro to MBZ diesels, crashed into in 2002