Regarding your question about the item with the following url:
http://pageinfo6.auctions.yahoo.co.jp/jp/show/qanda?aID=f149022676
the seller replied saying they uploaded a picture. The length
is about 64 cm and the width is about 48 cm (the seller also
says to please consider they are not experts, so maybe the
measurements are a bit off).
If you have any further questions or anything is unclear then
please let us know and we would be happy to help.