July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!
Lower Crankcase Pan Face
WARNING: This page is about a different car, the 2003 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Lower Crankcase Pan Face Bolt Holes
Courtesy of GENERAL MOTORS CORP.
Fig 2: Lower Crankcase Pan Face Bolt Holes Specifications