This one.
They also sell via Amazon.
The clip fits my trunk perfectly, but mind that EU cars all have the trunk liner.
Edit: I also forgot my full "mod list" in the first post!
Exterior:
-Valenti Red/Clear Brake Lights
-Valenti Red/Clear Fog Light
-Ducktail Spoiler by Spiller Tuning
-OEM Sharkfin Antenna
-Grimmspeed Hood Dampers
-Subaru Outback 55W Fog Lights
-LED License Plate Lights
-Chrome Indicator Bulbs Front and Side
-Custom Rear License Plate Frame Black Stainless Steel
-Mishimoto Oil Drain Plug
Interior:
-BRZ Facelift Radio Surround Leather
-BRZ Facelift Odometer Cover Leather
-BRZ Facelift A/C Console
-BRZ Facelift Window Consoles
-BRZ Facelift A/C Buttons
-BRZ tS Shifter Surround with black OEM VSC Buttons
-BRZ tS Door Panels
-BRZ tS A/C Console Surrounds
-BRZ tS Air Vent Surrounds
-BRZ tS Steering Wheel Application
-BRZ STI Sound Changer
-Yospeed BRZ Badge Matte Black
-OEM Armrest
-OEM Floor Mats Red
-GT86 Shift Knob
-LED Trunk Lights
-SpaceCitySpy Trunk Strap
-Mann Activated Carbon Interior Filter
-DOMO!
Suspension and Wheels:
-Eibach Pro Kit 25mm/20mm
-Enkei Yamato 18" (Dunlop SportMaxx RT)
-s2carbonworks Lug Nuts Black
-Whiteline Camber Bolts Front
-Whiteline Camber Bushings Rear
Electrical:
-Pioneer AVIC F970BT
-Valenti Euro Winker Relay
-BW Rear View Camera