These are ox shoes. Since they are mismatched, part of 2 different sets. Oxen are commonly steers that have been trained to do work, usually in pairs. Since oxen are bovines they have cloven hooves, so they need eight separate shoes. Oxen provided power for farm work before engines were common, and still are working hard in many places today.

Two references you may like:

 

http://makinghistorynow.com/2015/05/if-the-shoe-fits-wear-it-or-in-this-case-wear-16/