Brake Lines

Ok well i bought the brake lines from rock krawler because they had the longest i could find at the time, well the fron ones are fine, but the back, i looked at the stock square piece and its formed to the axle, but the rock krawler brake line is just flat on the bottom.. well i know that something with a flat bottom isnt going to seal to something rough so what do i do? any help?

What the other dude said in your other post.

Maybe file down the roughness?