Installing 1976 knuckles out on a 1969 front axle. I also installed dust shield eliminators. the brake lines to feed each wheel come from the frame above it instead of the axle. I'm sure others have run in to this and looking at what brake lines were used. the current rubber lines that were on the truck from the frame to the center of the top of the drum were 16 inches long. statically from the frame to the caliper is around 19 inches plus the need to add suspension drop, turning ect... let me know your thoughts, Paul.............