Not the brake line that everyone loves changing to stainless steel - but the non flexible metal brake line that attaches to the rubber brake line

anyone know the part number for the rear passenger side?

Or perhaps have this part used?

Mine is currently leaking...

 

Here's the part code for the right rear - 46284.

I imagine shipping would be expensive, considering it's one solid preformed line from the front of the car to the rear. Your best bet is to cut the line, flare it, and install a new section of hard line.