needs to be a C206 because the old stove is that "poke hole and stay connected" type
found a US supplier (most google hits are in the UK and for science supply companies), and she sure looks like 100% butane...
http://stores.goextremeoutdoors.com/-strse-2279/C206-Camping-Gaz-Fuel/Detail.bokgonna have to do that hike in summer, I suppose
I recently did a comparison in how efficient, or better how inefficient this old setup of GAZ stove with 1980s Belgian military rectangular pot is, and if I remember correctly, the Jetboil Sol was about 30-40% more fuel efficent at room temperature.
