brake line flares

are all stock brake lines 45 degree double flare? im working on a d50 its actually a mitsubishi.

no not all , most are

use 3/16" line and a double flare tool and the metric fittings. they will fit the 3/16" line. most auto parts stores also sell the metric line.

What youre working on should be 45° double flare, but not every car is. There is also a bubble flare but its on late models.