I want to use Skyjacker FBL27 extended brake lines. Putting a 1980 Dana 60 under a 77 K5. The brake lines are for the D60 , will they fit the hard line on the frame? I called Skyjacker and they could not answer my question. I will be using a Skyjacker 4 inch lift . If not will the Napa 38872's be the right length ?