Front brake line connector

[kwmech]

Not exactly sure where you're talking about. Earlier trucks had the lines from the prop valve going to their respective sides. Square bodies moved the prop valve to the front x-member and went side to side from there. Now the 1970 being drum brake had a single line that came out of the prop valve and split down on the frame, so which fitting exactly. Going from the drum to disc, you'll have to swap out the proportioning valve anyways, so my guess is to get some long pieces of brake line and learn how to double flare or purchase the brake line kit for a 71 or 72 from Inline Tube and go from there