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