Hello Geralt,
I believe terminal size is an industry standard. But ...
The terminal locations are not. It depends on the cables you have fitted.
Although, of course these can be changed.
There are several terminal configurations.
This can be important, in some cases, VITAL.
You do not want to connect the battery terminals incorrectly.
Despite their different sizes, this is quite instantaneously easily done, and will blow the main 100/120 A fuse.
The other consequence of selecting the incorrect terminal configuration is that the correct leads won't reach !
Battery physical size ? There are many !
I have the V6; from memory capacity is 65A/hr, CCA about 600.
I find Tanya Batteries very good. Supplier, not a brand.