Ok, when I start at their home page and search brake parts for 2013 Legacy & OB 3.6R the Cusco brace shows up, not the GS. But this also says RHD only, so... http://www.rallysportdirect.com/Cusco-692-561-A-Brake-Cylinder-Stopper
I was doing the "parts for your car" search from the page the GS brace was on and for some reason it stays on that page.