Jan, I have a couple of these stoves. It's nearly 2am here so in the morning I'll have a look at the fuel line nuts on my stoves. From the pictured stove here, the nuts look to me like they could be the same as the nuts that fit onto the the Hollow Wire that feeds Hollow Wire lamps. If they are, I have plenty here and can send you a couple.
thanks Matt, I do have a new pair, I just need to cut the fuel line, change the nuts then splice the line back together Jan