neff 8524x6gb integrated fridge/freezer ?

I bought it second hand and it didn't come with any fixings. It could be about 5/6 years old. It looks as though the hinges are meant to fix directly into the cabinet doors (although they do not appear to be the same size as the holes predrilled in my ikea unit). Does anyone have any ideas on how to install it. Do I need to buy a sliding hinge kit ?