Call Safeguard Sound and Security. They are an authorized Becker dealer, and have a lot of used units for sale.

http://www.carstereoalarm.com/

I know for a fact they have the complete system that came out of my old 1993 300E when they put in a new Nakamichi system.

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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".