You can have an aftermarket unit installed for a total of around $200 in the mid-Atlantic region. Once you buy the glass then what? Take a peek at the online service manuals, see what's involved before you buy it.

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Hanno
'79 6.9 Sold (after 27 years)
'83 280SL, 5 spd.
'94 E320 Sdn. 5 spd conversion
'02 E320 Sdn.(on loan to mom!)
'87 300E (5 spd. conversion) Sold
'05 E500 Wagon