The width of the space for the fridge freezer is a standard width - but I cannot remember what that is. The height was just half an inch less than the fridge freezer we bought - fortunately the centre cupboard section at the top of the fridge/freezer space can be unscrewed and moved upwards quite easily, so it now fits - and looks better with the centre cupboard tops slightly higher than the side ones - at least that is what I have told my wife since it was me that measured up in the first place!
Hope this is of some use.
Carol and Ali