You can order the appropriate wrench from your local MB dealer's parts counter (or from PartsShop, if they stock it). You'll also need a 22 (I think) socket to slip over the top of the wrench and of course a ratchet and extension. The tool should only be about $8 or so.

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Rgds,
Aaron Greenberg
MB technician
'67 250SE Cabriolet
'77 450SL
'79 6.9
'79 6.9
'80 300SD
'81 240D
'85 380SE
'89 420SEL
'93 300E 2.8