Where can I get this brake line piece?

I have a 1974 Plymouth Scamp (so the fender badge says) with a 3.7L and front and rear drums. I've been able to find the piece that connects from the hose to the back of the brake housing and I have found the hose. What I still need is the piece that runs from the hose to the (proportioning)? valve. The piece is 16" long.
Anyone have any suggestions on where to purchase?
Thanks in advance

Inline tubes!