Is there any way you can post a picture of the broken ring on the non-drive side? I'm not clear on what that was. Is it part of the bottom bracket? The lockring maybe? Or is it on the crank?

As for the large chainring, if it won't fit and can't be made to fit, Harris will take it back in exchange. They're very good about that. Is it steel? If a magnet sticks to it, it's steel. If it's meant to work on a 110 BCD, seems like it should work, though there may be something different about the spider on your crank. Again, a picture would be good if you can do that.