Front frame rail/a arm advice needed.

I think you are correct, although the front of the rail does not look very good, it does not mean the entire rail needs to be replaced.
The a-arm mounts definitely need to be replaced, and I did find a company that makes them.
The top of the rail between the a-arm mounts is rusted, as expected since it is basically a bathtub for dirt and water to eat away at the metal.

I will clean the entire area up and check the rail top to bottom.
I want it to be safe, yet I don't like the idea of sectioning a piece that has nothing wrong with it just for the a-arm mounts. I like the idea of a complete used rail, but if I only need the mounts and the existing rail is good, it seems like too much.