74 Scamp brake line

Hello y'all.
I need a bit of help with finding a certain brake line. I have a 74 Scamp with 10' front drums. I need the brake line that connects to the short rubber line on one end (at the frame) and runs under the chassis to (what I believe is the proportioning valve). The line is approximately 14 inches long.
Sorry for the sketchy details, I'm not to familiar with the proper names for each piece.
Also, I really don't want to spend $200+ on an entire kit, just that one small piece.
Thanks in advance, Derek