Kia Ceed ED help with battery selection

Hello all, I need your help to find a new battery for my Kia Cee’D ED Crdi 1.6 Schrägheck Bj. 09/2012. I have already searched the internet, but I get with the type key 1260/AAK so many allegedly suitable batteries, but they all differ in size and type. Unfortunately they did not have a suitable battery at Atu, because it apparently needs a certain type of fixing. At Kia itself the battery costs 170€ + 100€ for installation That seemed a bit expensive to me. Thank you very much.