I searched on ebay and found quite a lot
A C AC Compressor Clutch Kit Chrysler Dodge Mercedes Pulley Coil Bearing 7SB16C | eBay
here is one - you can filter down the list and find just the magnet coil too for less money. Your compressor model is 7SB16C and is used in a lot of mercedes benz sedans, SUVs and also on the sprinter vans.
I have replaced the clutch itself on these compressors without removing the compressor or even discharging the system. Its not too bad of work, the only oddball tool you will need is a large snap ring plier to remove the circlip for the magnet coil.
Make sure you set the clutch gap correctly - on these compressors its set by a stack of shims that look like 6mm metric washers behind the pressure plate of the compressor. On these ones set to 0.6mm - nothing more.
In my own car I used a genuine denso clutch which cost me 100 dollars about three years ago - it was a genuine denso reman assembly and contained a new pulley and pressure plate along with a new magnet coil and its little hardware too.