WARNING: This page is about a different car, the 2006 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Structural Dust Cover
Courtesy of DAIMLERCHRYSLER CORP.
1 - STRUCTURAL COVER
2 - BOLTS
The structural dust cover (1) is made of die cast aluminum and joins the lower half of the transmission bell housing to the engine oil pan.