[unlocoed]

Hi folks, can anyone confirm if the bearings from the following headset will fit properly in my giant glory?:
http://www.ebay.ca/itm/271219455452?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

I'm thinking i need Overdrive Zero Stack, and not Threadless, based on the one i see f/s here..:
http://www.blueskycycling.com/product/6896/42/Giant_Overdrive_Zero_Stack_Tapered_Headset.htm