2001 Protege body rust and horn issue

I am looking to patch up the rusted rocker panels and rear wheel arches on my 2001 Protege LX 2.0. Would the widely available patch panels and sections be good enough for it?

For example:

https://www.ebay.com (commissions earned)

http://www.topbananaparts.com/passenger-side-rear-wheel-arch-32.html

I also noticed my horn has started making a low (almost) screeching noise when it was much louder a few months ago. I suspect it may be rusted, but not entirely sure where it is located or how difficult it is to replace. Any advice?
 

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Last edited:
I have attached pics of the wheels on my first reply. Now for the rocker panels.
 

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