Thanks, guys. I have tried online, but couldn't find what I needed and otherwise, because of where we live, I'd have to get to Broome with the hoses I've got to have a look around.
Here's the old and new hoses:
http://www.aulro.com/afvb/attachment...1&d=1362204374
And the bottle fittings, which are just the usual barby size:
http://www.aulro.com/afvb/attachment...1&d=1362204663
So that's why I went through my collection of brass fittings and made something up. We haven't used the damn barbecue for years because of this new hose problem, so I figured this would get things going. If you guys reckon it's fine as long as it's gas-tight, then that sounds good.