cant find rear brake hose!!!

[old Chevy guy]

Im changing out all the brake and fuel lines on my 71 C 20 before I put on the new cab. I cant find the correct rear flex line for my truck. It bolts to the rear axle on top of a bracket bolted to the rear cover and has a junction built in that has 2) 7/16 20 female holes the other end is horse shoe clipped to the chassis also with a 7/16-20 female hole to accept a 1/4'' steel brake line. Has anybody else had a problem finding this? does anybody have a part number? Here's some pictures. It has rear leaf springs.