Bronze is a good way to go, but check the different ones, as mentioned, McMaster Carr is a good source, pay attention to the load ratings, the bigger...
It should be ok assuming you run large enough wire from the battery to the fuses and that you don’t have anything else connected that generates a lot...
Ball bearings aren’t the best option since they will barely ever move. They load rating is half when they are static and the load essentially on one...
I installed some poly mounts recently from Summit and they worked well. I did it when I was replacing the engine. One tip for you if you decide to do...