Ok here are the fender pieces. Below, after acid bath.
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And Below after polishing:
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These pieces are by far the roughest part of the running boards, probably from years and years of being hit with rocks. The one on the right with the chunk out of the corner also has some damage at the bolt hole. For now I'm going to run a large washer over that. Long term I'll replace those fender pieces entirely. I'll either get some plain sheets of aluminum or diamond plate aluminum to replace them down the road, but they are fine for now.
@Soundmound I'll be rockin' these on my C20, keep in mind the C20 sits quite a bit higher than a C10 would, but of course I think my C20 is lower than a K truck. 4 years I've been looking for an affordable set of running boards that are complete, as in all the pieces are there. You wouldn't believe how many times I've looked at used boards just to find out all the bracketry is gone. So I'm super happy with these so far. I think the boards themselves are pretty good shape after being cleaned up. It's just the fender pieces that are probably not going to look the best, but we will see after installation, maybe they will be just fine.
I honestly have no time to install them this weekend, but thinking of making the time I really wanna see them on and start using them ASAP!