alternator installation

Hey Guys, I'm replacing my alternator and ready to start putting things back together. I found this bushing sitting on my frame, and can't figure out where it came from. It fits the bolts with the 12mm head. I've removed the various brackets for the transmission cooler lines and wiring...

I upgraded the factory alternator to a higher amperage unit to support, among other things we want to do, charging a travel trailer under tow. In another thread titled "Trailer Power" https://forum.ih8mud.com/threads/trailer-power.1317688/ we were talking about powering a travel trailer from...