that is the <$10 part that usually is the weak point on the rear window
regulator on a w210. it is not a drop in replacement as the 210's
part isn't an exact match.

if you've verified that this part on the 210 has fractured, this new part
may be retrofitted into the 210 but you *must* drill out the rivet on the
new part, use the green doo-dad to replace the broken white one on the
210. yes, you'll need to rivet it in some fashion onto your old regulator.

so some labor is involved. if you opt not to use this 'replacement' part,
your only other option is to pay for a new regulator assembly, which will
run you upwards of $50.
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Following your advise thats what I did and worked out fine.

Thanks Raymond