The hex socket(allen-type) used to remove the fan/fan clutch assembly is actually an 8mm. The tool with the MB star imprinted on it is made by Stahlwille. Part number on the tool is 10301109.
You might be able to get one at PartsShop. There are places all over the WEB that sell the socket and the ft. long rod bent at one end to secure the pulley from behind.
1991 300-SEL - Model 126
M103 - SOHC
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