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So I replaced both arms over the weekend. What a big difference. No more loud clunking noise, and the rear doesn't bounce that much over uneven surface anymore. I should've replace these a long time ago. As for the part number, the old ones on my car had part #986 331 143 04, with the triangle logo just like spendy said. My new arms from Vertex, supposedly TRW (they never got back to me after I emailed them asking about the different part numbers), don't have the triangle logo, and have part #986 331 143 06. I compared the new and old arms, and there's a difference in the beam profile, or curve. But still, the new arms fit exactly in place without any problem.
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