These are fused the same way. Still haven't found specific directions for making the stretched neck, though:
http://www.alibaba.com/product...
Edit: Go here to Flickr to see a stretched neck Dr Pepper bottle:
http://www.flickr.com/photos/s...
Hope that one works.
I'll keep looking.
It's really easy if you have access to a kiln. I think the temp of most of that glass has to be about 1500* F, but I can't remember for sure.
