July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!
Section 37 (Differentials): General Description: Specifications: Identification
WARNING: This page is about a different car, the 2005 Subaru Baja. However, it is still accessible from the selected car via links, so may be relevant.
Except non-TURBO AT model
Fig 1: Identifying Differential (Except Non-Turbo AT Model)
Courtesy of SUBARU OF AMERICA, INC.
Non-TURBO AT model
Fig 2: Identifying Differential (Non-Turbo AT Model)