Weird compression fittings

[jetfixr]

I got these compression fittings with a transmission cooling line kit. The ferrules are suppose to be compressed on to rigid stainless line. I have been to the hydraulic shops and automotive shops around here and no one seems to be familiar with them. I know I have seen them in aircraft applications, but have never actually ever had to use one, our lines come pre-made with fittings pressed on. Any way the the ferrules are different then the standard brass ones I am used to (Cant be put on backwards). Which way does the ferrule go on to the stainless? Don't want to put it on backwards cause I can't find any spare ferrules for these things