Any advice on how I can get a new replacement for this? I believe the part is 16720-P0A-A02. Honda discontinued, and I tried O'Reileys, Auto Zone, and Advance Auto Parts, and they don't have this. All I can find on eBay are used. Rockauto also does not have this.
There is ​​​​​​a banjo connection on both sides. Mine is leaking from the rail line rubber-metal connection.

 

I haven't seen that part fail on this forum, so you might try a junkyard. There are hose and hydraulic shops that may be able to make that fuel hose for you.

 

Just to complete this post, I did, on PAhonda's advice, seek out a hydraulic repair place in town.

They did a nice job brazing the two ends. The cost was $21.