The Cusco kit? Yes at least one guy was installing it, he got it from FT86SpeedFactory? I think or maybe Rallyperformance. It costs over $700... now I'm not 100% sure the oil cooler is the OEM one but it sure looks like it.
I think you could duplicate the kit for about $200. Use the parts Kosta referenced from Subaru, buy a couple of those radiator hose to 1/8 NPT adapters off ebay for cheap (they are $10-15) and then you just need the NPT to hose fittings to connect it to the oil cooler like these:
http://www.summitracing.com/parts/ear-984004erl
Cusco uses some fancy banjo fittings, you could get those too if you really wanted to.
The upper radiator hose is 38mm, I bought an adapter to use with a water temp gauge awhile back, the lower is probably the same.
Only thing it looks like the Cusco kit has over a DIY is custom molded tubing.