lee i don't think he can flare a line like that with just a flare kit . . . that fitting on the steel piece seats against the nut and the fitting.

it seats both ways and then compresses when tightened against both, no?

i know there are some compression seals you might be able to buy to make this work, sort of like a compression fitting you can use to half-ass a brake line fix but i wouldn't trust it. i'd buy the line if it was me