action marine webster,ma 01570 ,limited industries -hazzard marine oxford,ma or go to omc johnson,evinrude.com but that part might be pricey look for a parts engine on craigslist.com
Lots of places here, but I don't know which ones will ship internationally.
Here is the Evinrude dealer locator for UK: http://www.brp.com/en-GB/Index.htm