Any Arai dealer should be able to get the parts, from what I'm told the aftersales policy is supposed to be fantastic.
Maybe DH Auto's can help you?! They will post worldwide, and are close enough if you have any trouble. 01782 613889, 12 George Street, Newcastle Staffordshire : ST5 1DJ
It's a tough call, I'm torn between spending serious cash on my 1100 and having contingency for a new engine at hand just in case, or the option of an 1150 ADV............. And then I saw a nice black KTM.........