Running board, what am I missing?

One of my running boards has what looks like a lip on the side facing out, but the other one is missing the lip. I just bought some stainless trim, and it looks like it might slip over the lip. I looked everywhere, but can't find that piece, or figure out how it attached to the end of the running board.

I attached a picture of each running board, and I apologize if the pictures aren't great, my garage is small and didn't feel like moving everything in the driveway to pull the car out.
 

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How does that outer lip attach?

If I can't find the original or a new one, can I substitute it with an L shaped steel beam that I would drill and bolt on and then cover with the trim piece?

I attached a couple of pictures of L shaped beams I had in mind.
 

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