Imperial has some pretty knowledgeable people on their staff. In fact I spoke with one of their reps just this morning. Imperial and Zoro are both wholly owned by WW Grainger. Grainger has the same stuff, but is quite a bit higher priced. You might give these guys a call. They kind of specialize in brake stuff.
http://www.inlinetube.com/Brakes are about the only use for inverted flares these days. Parker-Weatherhead is now owned by Eaton and they don't have much interest in slow sellers.
I use nothing but Cunifer tubing on my old jalopies. I usually buy some in Europe, but when I run out, I buy some from these guys.
http://www.fedhillusa.com/I have bought nuts from them. I have never asked about other fittings.
