Screen replacement on ebay: http://www.ebay.com/itm/Touch-Screen-Digitizer-Glass-Lens-For-Alcatel-One-Touch-Idol-X-OT-6040D-OT-6040A-/191114689404?pt=US_Cell_Phone_Replaceme... Replacement guide: http://www.youtube.com/watch?v=h7RngLHCZ... Good luck(:
You can try to heat it with a heardryer and then quickly add force to the steer (does not really matter in what direction). Have you already tried WD40 (or similar lubricant with corrosion-soluting components)? Sometimes a nice bump with a hammer (and a piece of wood on your stear to protect the paint) helps.
The two types of screen might not be compatible. It's probably the same problem as with the Nexus tablets: the 8GB LCD is not compatible with the 16GB's (in this case CDMA with GSM). The question is: which phone do you have? Do you have 3G, or not? The info is sometimes found beneath the battery. Good luck and don't be afraid to ask;)