need part numbers for replacement rubber brake lines

[l79m20]

I have a 1966 GMC 4000 which runs great but does'nt stop well. The culprit is the rubber lines that attach to the steelbrake lines coming out of the master cylinder. they are roughly 6 inches long and both have female ends at each end. I am interested in the original numbers if someone would have those so that I made order new replacements. These are not to be confused with the rubber lines to the wheels. Thanks in advance