Where is the 4th antenna in X201s?

[Zhenech]

I'd like to add WWAN to my X201s...
Looking at the HMM and the parts-list, it should have the 4-antennae kit (the 6-antenae one does not fit in the s-series according to Lenovo )
That would make 3 antennae for WiFi and one spare, which I could use for WWAN.
However, I can't find the 4th... There are two coming out of the right hinge (white and grey) and one (black) from the left (you can see pictures of the opened X201s here: http://www.flickr.com/photos/27348998@N ... 708942921/). I'd expect seeing two here...

Does anyone know where they've hidden the 4th antenna?

Edit: ooookay. According to http://www-307.ibm.com/pc/support/site. ... MIGR-71896 there are two antennae kits, Wireless LAN/USB antenna kit 43Y984 and Wireless LAN antenna kit 44C9997. The first one seems to be the 4-antennae one, the second only three? This is also the one listed for my 5413-A13 X201s
I also found this picture: http://www.51nb.com/forum/attachments/m ... VRDsUW.jpg which is the WUSB slot in the middle of the board. and thats the 4th antenna in there... but not for me