Hi Dervish,
from the reading I have done, most people have had a lot of trouble with fitment of there products. It involved cutting, filling and from the sounds of it heaps of work to get a suitable fit. I personally haven't purchased from Viva, but I know a few people from South Australia have purchased those front bars. Im pritty sure RubyRS4 from the South Australian pages would be someone to give you a little more advice. Pritty sure he purchased one a few months back.
Goodluck with your decision.