I can have an aluminum stop sent out to NZ, I think shipping will be around 12-15 dollars. So you're looking at 72-75 USD for it. If you want delrin pieces add an additional 12 dollars to that.
Just realized you are in Wellington! If you like come out and have a look first hand if you like. I have my bike in bits at the moment, changing a few things so will not be ready to fire her up for another week or so.