The first one is a copy of the Dolphin. Aaron has one on his car and can explain the difference when he sees this thread.
I've got one which i bought from the same seller in Japan with a friend at the moment which i will pick up when i am there early October. If you do buy the first one, pay the extra to get it painted in your vehicle colour from the same seller. The link you have posted comes unpainted.
IMO it is worth the extra 4,500Y to have it painted then sent. Would probably cost more than $50 to get it painted here.
Link to painted one: http://page.auctions.yahoo.co.jp/jp/auction/150272379
If it is white like the ones in the link (& mine) the paint code is QX1
Agree with Iain, either will fit the Aero bar.