Here are the Toyota part numbers for the Nav Casing + Motor - keep in mind that it costs about $700 US dollars.
Top Air Vent Peice - 55662A
Screw Cover for Air Vent Peice - 55544D
Up/Down Button - 84932A
Tilt Button - 84932A
Connecting Wire for Buttons and Tilt Control
to Circuit Board - 82141B
Screen Top Cover - 55443A
Screen Casing - 55479B
Circuit Board Casing/Holder - 86843
Circuit Board/ECM - 55313B
Under Mount peices required for movement - 55683
Right Side Pivoting Mount - 55682
Left Side Pivoting Mount - 55681
Motor - 85435A
Gear - 55678A