quattroworld.com Forums: Rear Differential Lock Controls, the whys/hows for the 92-94 UrS4, 95 UrS6, S2 and RS2
Blokka Rear Diff Lock for Subaru Forester Legacy Outback Impreza XV (diff R150) | eBay
Diff locks: What they are and how they can help you get the job done | CarsGuide
Rear diff locker 9" for Mitsubishi Pajero, Delica | eBay
What is the difference between the rear differential lock botton and center differential lock botton, and can four-wheel-drive vehicles fit the two buttons together in one car? - Quora