Just done a Google search and all it came up with was lots of JDM parts for Nissan's and Honda's. The quality does look good in the add though and it does look like a golf back box, and any decent exhaust fitter would be able to make it fit in any case!! I bought i very similar looking "universal" back box for my Merc and got it fitted no probs for £40. They had to weld on brackets, etc.
Stu