I ordered the exact cables you are looking for the for the 47 1-ton dually I'm working on from In-Line tube. Pretty good communication and they fit nicely at the drums. They are dangling now until I de-rust the frame, paint and prime. They look like they will attach nicely to the front cross bar across the frame. You will need to provide them some of your original hardware at the drum. Actually I think the piece you are missing, though that is junkyard common. If I had the chance I would do the SM-420 brake if I could. Best - Joe