This is an original Behr R4 radial A/C compressor clutch pulley mounting hardware kit.
This is the original design where the screws hold down the outer portion of the pulley to the inner clutch assembly, and then the washer is bent over to lock the screw.
This is a General Motors design and was used on 1970's - 1980's GM A/C compressors also.
There are 2 different designs, this being the later, the screw and washer are one piece, and I have the other design available also with separate screw and washer please see 923 990 00 01-2 in the eBay search.
The Mercedes part number on this is 923 990 00 01 and the Behr part number is 70 128 06 021
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