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If the running board and splash apron are one piece they are original. All of the replacement ones I have seen are tack welded.
As to the metal trim it was on all four sides of the running board. The long trim piece next to the splash apron is the piece I believe is not made today. It was bolted to the running board with flat headed bolts and the rubber mat slid into place over the bolt heads in a slot like manner. The other three metal trim are not unique.
When I redid the running boards on my early 1930 about 15 years ago one vendor offered the original style trim for all sides of the running board.
Hopefully you have the original trim and can restore the price not offered today.