Where to find tube nuts & sleeves for steel line?

[795.0]

I'm looking for a source for -6 and -8 tube nuts and sleeves for use on 37* AN flared steel line. The ones I see at Jegs and Summit appear to be used only for aluminum hard line. I've found a couple 37* flaring tools as well, rigid and parker-rolo, but they are also meant for softer copper / aluminum line. Thanks.