The 10P15C compressors that the Benzes have are different from the others. They have a plug that is attached to the rear of the compressor. I've only seen this plug on MBs and is used to shutoff the compressor when the vehicle is under full throttle or kickdown. If you get another 10P15C compressor from another vehicle and find someone to rebuild it for you, considering the compressor isn't locked, a competent mechanic can rebuild it for you.
I've heard of people using the 10P15C compressors from other cars: Toyotas, Fords, etc.. and have had problems with excessive drag on the engine from the compressors not shutting off.
99 C230K Sport