Hi! I just measured the cards and they come in at 65mm x 47 mm, which doesn't exactly fit any type of card sleeve. I think your best bet would be Mini Euro sleeves, but they may be a bit snug (68x45mm).
Swan PanAsia SWN-009 (47 x 70mm) may also work. Swan PanAsia sleeves tend to be a little smaller than the listed dimension, so they may be too narrow.