You should check in the parts book to see if they are the same, I would have said/guessed the brake lines were the same for a 1 ton AD truck with single or dual wheels, now I'm curious.
http://chevy.oldcarmanualproject.com/parts/1929_54/index.htm

If they're not the same then at this point I would make my own copper nickel lines. It will cost less than $200 (don't forget to add shipping twice) I'm sure and it's not that difficult at all if yours are in good enough shape to copy.

Grigg


•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-