Hi Diego,
I recently uploaded my repair guide on how to replace the DC jack power (charging socket) on an ASUS 1001PX which also includes the removal of the upper unit/touch pad. You will find it here: [guide|96332]
What is actually needed in your case is a 12 pin flat ribbon cable which you easily find online, for example:
http://www.ebay.com/itm/Asus-EEE-PC-1001PX-Cavo-Flat-ribbon-per-Touchpad-cable-cavetto-for-/311531760729?hash=item4888bd6c59:g:Q34AAOSwsFpWT5O8
https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313.TR1.TRC0.A0.H0.Xribbon+cable+12+pin.TRS0&_nkw=ribbon+cable+12+pin&_sacat=0
For sure, you can also buy the entire touch pad unit, for example, here: https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2380057.m570.l1313.TR0.TRC0.H0.Xtouch+pad+asus+1001.TRS0&_nkw=touch+pad+asus+1001&_sacat=0
However, if you only need the flat ribbon cable, I suggest that you buy a single ribbon cable that is as long as your old one is and just fold it the way you need it. This should do the job!
Steffen