alternator removal

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 have read several threads as well as swapped on 80 series alternator previously. I am missing something as I read the alternator can be swapped without removing the battery, battery tray, oil filter and Power Steering Reservoir to Pump hose. The last swap I assisted on we pulled the fan...