Easy to lose and absolutely required. Will fit all V6 and V8 engines from 1998 to 2006 if you have the space (except M119 engine)
This clip is unique to these engines. The picture below will show you where it is attached to the fluid outlet tube on the tank. This is a genuine Mercedes part.
M112 V6 M113 V8 Power Steering Reservoir Tank to Pump Security Clip
$7.20
SKU:
GEG-M113TANKCLIP 
Product Details
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$34.50
M112 V6 M113 V8 Power Steering ADD-ON Magnetic Inline Filter
This unique filter can prolong the life of your power steering. Will fit almost all V6 and V8 engines from 2000 to 2006 if you have the space.
This magnetic inline filter can give additional life to the power steering fluid on the M112 and M113 engines ( V6 and V8 from 1998 to 2006). The filter has 3/8 inch nipples and can accept a 3/8 inch hose ( size normally found in the return hoses on M112 and M113 engines.
$56.25
1998 to 2006 M112 V6 M113 V8 Power Steering Fluid 40K STANDARD Service Kit
NOT FOR ABC models! This is an easy D.Y.I. procedure that you can do in your garage. Fluid available and our add-on magnetic inline filter can be purchased separately below. Full instructions including bleeding air out of system are included FREE.
For 2000 to 2006 chassis only mentioned in the title. But Please Please READ. Does not work with ABC suspension.