Anyone know what this is? Looks different, where does it go?

 

Ground terminator. Bolt it to metal.

 

it went on the bottom bolt of the trailing coil bracket

 

Look at mr. specific here! Lol.

 

It's essentially a ground junction. You'll want to attach it back to its original location. Before you do, I would remove it from the connector and check it and the connector for any corrosion. Clean both if need he and resecure it.

 

This is a good excuse to buy a can of deoxit. It's the bestest.