Rear brake hose confusion

Ordered a rear brake hose (brake line to axle vent) for my 70 Challenger
Vendor sends me H610, looks correct but was about 1/2 in too short
Looked it up; unit is for a b body. Returned it. Visually, it was correct, but was short. Male /female threaded on the two ends

Then I ordered a correct Inline Tube unit #H648
This is listed as the correct e body rear hose.
This one has the correct female threaded fitting on one end
and the other ended is permanently connected to...

Rear brake hose confusion