WARNING: This page is about a different car, the 2003 Subaru Outback, 2003 Subaru Legacy, and 2003 Subaru Baja. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect ground cable from battery.
Remove lens (A) and spot light mounting screw (B).
Fig 1: Removing Lens & Spot Light Mounting Screw
Courtesy of SUBARU OF AMERICA, INC.
Disconnect harness connectors and remove spot light.