57 cab, 58-59 short bed and a 59 short bed chassis. All fits nicely I guess. So you order a short bed 59 3100 tube kit. So what is the question?
Since you are making a short bed out of a long bed chassis and are cutting off the front for the 57 clip, it probably does not matter what brake kit you get. Don't think the extra horn length factors into the tubes. Call the vendor and explain whet you are doing and see what they say.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
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