Well i thought i had an earlier thread about this but here is what i found out. That particular bumper, as people have pointed out, is a one off. However there is a company in Italy called TRC that makes a kit for the Z they call the Marangoni Z Hydro.
You can check out their price list here:
http://www.trcitalia.it/listini/list..._eng_bassa.pdf
Its slightly different, but only slightly. In the end i decided id save the money and get a roll cage since to me performance and safety outweigh looks.