Gaming is for having fun. Fun requires clear rules.
Mini-european sleeves from Fantasy Flight fits very well. There is about 2mm in top, but I'm afraid that 43x65 is too few. For me it looks rather like mini-american with some margin. And I think there is a problem with sizes because some producers gives the size of cards and some gives the size of sleeves. This Chimera looks for me like mini-american with size of sleeves given.