Give Holt's a call - here's their Don Carlos line...
http://www.holts.com/cgi-bin/ncommer..._points=&mode=
The other option would be Tampa Sweethearts.
http://tampasweetheart.com/?page=sho...01c9687bf4649d
For sure I would call Tampa Sweethearts - because if they don't have it (or aren't going to get it) - NO ONE (literally) has or is going to get it.
Either of those retailers will take good care of you - and are very good at answering questions.
BTW - I've never heard of a "Vanela" in the Fuente or Don Carlos line... The width is hard to figure out from what you gave us. 1/2" diameter is not the standard way it's done. 1/2" equates to somewhere around a 40 ring gauge. The closest I see in the Don Carlos line is the No. 3 (5 1/2" length X 44 ring gauge). Vitola in that range is sometimes referred to as a "Lonsdale" or "Pantella". I'm almost willing to bet you that's what he had.
And, BTW, the Don Carlos line is fantastic!!! :smiley2:
Hope that helps...