I am going through this same search right now, seeking a set of these Suntour Barcons, the same kind that I use on my Bianchi in Jamaica. A few people on the for sale forum have already offeredd sets and I am in offering stage right now with one seller. So, check there first, then Ebay (good luck right now, nothing there for my interest or yours). You will get lucky and, who knows, even for a good price. I should add that a set of trigger shifters will also get the job done assuming that you can get them around the drop curves.
My favorite indexed Barcon...
