Subaru 2005 Impreza - Manual (Page 407)

11-26
Maintenance and service
5. To install the air cleaner case cover, insert the
three projections on the air cleaner case into the slits
on the air cleaner case cover and then snap the two
clamps on the air cleaner case cover.
T Turbo models
1. Unsnap the two clamps holding the air cleaner
case cover.
UGB094BA
USB521BA