2007 Gem Car Turtle mode issues

Do you have the dimensions for this support structure for the li battery swap? Thanks! Much appreciated!

I used 1" by 4" fence boards to fill the space, to reduce the noise
The lithium battery slid in from the back
I had a cart that is about the same height as the battery tray & slid the battery in by myself
You could also just put the battery on a couple of pallets & back the GEM close enough to slide the battery in place

Where should the money be sent for the li battery?
Thanks!

To Michael aka @LithiumGods