70 Duster use 1 or 2 piece(front to rear) brake lines?

[Ehbody]

As stated in the title, '70 Duster with manual brakes(front KH 4piston)...both"In-Line" and "The Right Stuff Detailing" stores only show 2 piece for 1970....1971 has 1 piece line. A friend of mine says that the 1970 models built later in the model year also had 1 piece.(The 1970 Plymouth service manual doesn't show 1 piece either).

 

[Purple Haze]

My 70 has 2.

 

[2 Darts]

I looked at the 70-71 parts manual and it shows a one piece tube from the front T-fitting (proportioning valve) to the bracket at the rear axle. The replacement part is a bulk roll of 25 ft tubing.

All tubing in the system is labelled the same in the diagrams. However, the diagram label subs to 4 different ODs, each with its own P/N.