Battery size to fit inside a group 24?

I have seen posts here in the past where someone guts a group 24 or 27 Mopar battery (reproduction)and installs inside that case a modern AGM type of battery, and connects the new battery to the posts of the outer case with cables. Well, I have my old group 24 Mopar battery gutted and cleared of all dividers. What brand and size of battery will fit inside this case? Thanks!

This is a group 27 case, but I have allot of extra room...