I was able to get pretty close when I made new lines for my 56 6100 rear brakes, I used the original nuts and copper nickel lines double flared. I'll try to put the link here that shows the picture, if I can't add the link search the big bolts forum for " tricky brake line " . Doug H in this forum also made some for his 56 6100 dump truck. Best of luck 👍
brake line
