The battery tray is pretty much crap. They don't understand bracing and movement under load. The little bent leg that goes down to the hole in the fender controls front to back movement reasonably well, it does nothing for side to side. The bent leg should have a gusset welded to it up to the bottom of the tray to tighten that up.
The two long legs down to the studs on the firewall are way too long with no bracing. They let the tray move fore and aft as well as pivoting around the little bent leg to the fender. We have repaired 2-3 firewalls where the Poison Spyder and similar trays have ripped out the studs after a lot of vibration. The fore and aft movement needs to be constrained very well. It is also very easy to figure out. Set the battery on it and shake it. You will see the directions it moves. Those need to be stopped.
We can't use the factory battery tray since it raises the battery up by another 1/2" or so and it is already too high.
Good to know. I haven't done a full unpacking yet, but I noticed the battery tray looked a little skimpy. I'll do a preliminary assembly soon so I can start getting a better visualization of how things go together.