Upper left is a bracket of some sort that is supposed to hold the thing that will fall off onto the thing that it will fall off of.
Lower left is something that latches together two parts that, since they are not latched together, will cause something bad to happen.
Thing on the right allowed something to swing back and forth within necessary limits. As you no longer have the thing that swings back and forth there is no need to keep the limiting thing. Of course, as soon as you throw it away you will find the thing it connects to.
Hope this has been helpful.
stay safe.