I have VSD1 which came with the double flange but early on I lost one of the tips. When I ordered the Heir tips from lunashops I also go a pair of DF tips but the ones I received at a very wide bore and they won't seal on the Tenores.
I have seen some VSonic iem's that come with a large array of tip selection -- does anyone know if there's a way to order these? EBAY has a number of tip selections/replacements but they are usually of the Sony, Klipsch, Comply, Westone variety. No VSonics to be found.