[NC-B17A]

Then in theory if Honda will sell the mounting bracket by itself then you could have it tac welded to the frame & mount the arm rest like factory.
That would be alot of work but I really want a pass side armrest.
From your pics I guess the easyest thing to do is just buy the large arm rest.

 

[NC-B17A]

I am on the pass side 99% of the time as its my wifes E so I am the one that wants an arm rest most.