Getting the dimensions right on an integrated fridge/freezer

[KarenCC]

Hi

This question probably has a very basic answer but I can't for the life of me fathom it out.

How do you get the right size of integrated fridge freezer when the kitchen cupboard in which it sits has barn door type openings for the top fridge and bottom freezer, please?

I'm quite new to the world of integrated appliances and though I've had to measure overall dimensions, I can't even find the separate top and bottom measurements online for this scenario.

The appliance is several cm taller than the 177cm that I've seen most of online. I'm assuming it can be propped up on something. There is plenty of room at the top in the cabinet. If I got one which is 60/40 as my current fridge... are the proportions generally a standard? Or do I need to track them down? And does this mean a 50/50 fridge is out of the question? Or do i just need to get a replacement kitchen cupboard door?

Many thanks for any advice

K