Actually, any ATX motherboard should fit on these cases. Cases have standards for mobos and from the looks of these, they are ATX cases.
Most likely, any mobo you will look for will be ATX. Have a look at this:
To be on the safe side, just make sure from the source that it is Standard-ATX mobo.
All cases I've come across supported micro-ATX mobos as well, but not sure if it comes by default.