I can beat that...W123 300D limo
http://cgi.ebay.com/ebaymotors/1985-Mercedes-Benz-250L-W123-5-Passenger-Limousine_W0QQitemZ250524133219QQcmdZViewItemQQptZUS_Cars_Trucks?hash=item3a5466e763

The bigger question is why someone would convert a 420 to a 300

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1982 300GD Carmine Red (DB3535) Cabriolet Parting Out
1990 300SEL Smoke Silver (Parting out)
1991 350SDL Blackberry Metallic (481)

"The thing is Bob, its not that I'm lazy...its that I just don't care."