Cannondale lefty headshok bearings??

Anyone know the bearing numbers for a Cannondale SI Headshok headset??

I need two replacement bearings but I'm not willing to spend €40 on 'branded' bearings when I know I can buy them on ebay for less than a €10 for the pair..

Any help is much appreciated..

Gmac

a quick look brought up this

http://forums.mtbr.com/showthread.php?t=345773

Cheers Pete...