Local auto parts stores aren't going to have a premade line in stock , The way I see it is you have 4 choices ,
1) stop at a local brake shop and have them install a section in your existing line
They may not want to patch a brake line ,
2) Call Inline tube and buy the section you need and have it shipped to you .
3) Contact Ecklers in Florida and buy a new kit and use the section from the kit you need and replace all the other lines when you have the time .
4) buy a short section and line connectors from an auto parts store and cut / flare and repair it yourself , But if one line "burst " the rest should be replaced .
You didn't mention what year or model truck you have .
https://www.ecklers.com/catalogsearc...q=brake%20line
https://www.inlinetube.com/?category...SAAEgL46fD_BwE
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1967 Factory short bed - Old school
'71 - 350 / 4bolt / 487 heads / Edelbrock C3BX
Muncie M-22 4 speed / Hurst Comp plus
Factory 12 bolt posi 3.73 / 255-70-15
Smoothed firewall / Factory cowl induction
Power disc brakes / power steering / 3.5-5" drop