I have a (second) set I bought from Tom at Delta Bay a few months ago. The difference that I noticed between these and the originals are that the reproductions are not stamped LH and RH. Also, the originals bracket sheet metal appears to be a stamping, where the reproductions are fabricated and bent and welded at the sharper corners.
If you were to stamp the reproductions with LH and RH, then paint them, it would be hard to tell the difference when installed.
Tom at Delta Bay said he didn't have many sets of these left.