I would suggest looking on eBay - you can even follow the link from the Forum that takes you there (Vulcan parts on Bay, I think). I'm sure you can get an OEM one online, but it will cost you some serious $$$ I'm sure, as all that stuff does.
My other suggestion, if you lived in the States, would be craigslist - but I'm not sure if you have that over there. What about motorcycle junkyards? Are there any of those you could check? I have gotten a lot of great parts - cheap - through one we have here.
Lastly, you could try posting this question in the "Sell/Swap" section here on the forum. You'd probably have better luck that way.
Best of luck : )
7800 orig mi when purchased Jan 2011
Turned 11,000 mi Nov 2011
Taillight relocation kit
Chad's highway peg mounts
Otherwise, all stock
"But it's a dry heat - like the inside of an oven"