Golf Cart Battery Boxes (Housing)

You would probably have to go to a dedicated battery type store maybe a Trojan dealer. When you say you are looking for same day it sounds like you're in a hurry so you can use your new batteries. Just be aware that the boxes are mostly cosmetic with the addition of containing leaks if a battery happens to rupture.

So if you just want to go camping and don't have a 6v volt box, just set them in the old 12 volt boxes and leave the lid off, or just put them on the frame, strap them down, and go camping.