The usually don't go through holes, they are clamped on top of the left frame rail, then to the back of the crossmember to the right side.
Through the front of the frame rails. Holes in the rails?Do the brake lines run through the holes in the frame cross-member?
Through the front of the frame rails. Holes in the rails?
Not in the rails, but in the crossmember. There is a hole on each end of the crossmember that would line up just right for the brake lines. But, as stated earlier, probably not the way to go. Thanks for the diagram...