There are only 3 variations from 2004 to now . T5 2004 to 2010 / T5.1 2010 to late 2015 / T6 late 2015 to present , what do you mean by T5.2 ? If there is a T5.2 then it will be the same as T5.1 in the shape of the head unit at least , and as I have seen same for T6 . The early T5 had a pure rectangular shape . Now in the same T5 model there may have been a unique head unit that was much wider than all the others due to inclusion of extra features . Don't quote me on that last one but I do recall some discussion years ago in relation to that .