Holding tank Bavaria Cruiser 33 2007

[Wahoka]

I want to change the holding tank on my Bavaria Cruiser 33 from 2007.
I have taken the front of so I see the tank but I cant get it out.
SVB24 are selling new tanks so I thing there must be a way to replace it.
https://www.svb24.com/en/p/bavaria-holding-tank-60-litres.html

Have anyone manage to do it?