I had to buy the one on the left just to get the combi bracelet (G-Shock doesn't sale them separately) to compliment my beautiful GW-B5600AR-1 (aka Sith Lord) on the right. The
Casio Watch Bracelet GW-5600 BC Black PVD/Resin G-Shock Bracelet | eBay
New to G-Shock, how is the Combi bracelet? | WatchUSeek Watch Forums
Casio G Shock Classic Core Watch Dw5600e 1v | G Shock 5610 Combi Bracelet - G-shock - Aliexpress