1991 300E Needs new Radio, HELP
 

I just bought a 1991 300E in mint condition. It is beautiful with only 70,000 miles. Only thing is the Becker factory radio won't work...had it tested...needs to be replaced. Can someone tell me which year of other Mercedes radios will fit with my car? I don't want to put an aftermarket stereo in it.

Thanks and any help will be appreciated.
Robin