I am wanting to replace my aluminum seatpost with a carbon seatpost but I'm not sure if the one I am looking at will fit.  I was hoping someone could help me figure this out?

Info:  I have a 2007 Fuji Aloha 2.0.  I am looking at purchasing a Fuji Aloha Carbon Aero Seatpost 300mm Sliding Setback.  I am looking to purchase this from eBay.  Here is the link:  http://www.ebay.com/itm/221039046697?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

The description says that it will fit any and all Fuji Aloha bikes.  I am just curious as to whether or not it will actually fit my bike and also, is 300mm long enough?  Any comments or suggestions provided is much appreciated.  Thanks.