If you are talking about the AHU/1z pot, I got a factory style bracket for my first van, from a fellow in the UK. If you go into the "vw t4 tdi conversion" group in facebook and ask, I think they will know the name of the guy. The brackets aren't OE, but could very well pass for it.
My second van, I built a bracket to bolt the passat pot bracket onto. Not a good picture but shows a little of the two brackets.