I believe that is the rear crossmember mounting holes. You have to have that installed before bearing any weight on the rear tires or you risk major rear suspension geometry damage. It's a big welded steel stamped assembly. You should see similar holes on the other side of the car. Contact itsnotanova on this forum to pick up a replacement.
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2003 S manual
Last edited by Jamesp; 06-18-2014 at 02:43 PM.
Reason: Fixed typos including "cat" for "car" :0
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