if you are looking for 'official releases' they should all be listed in the discography under the By Songs Listing.
For Elevation for instance on
http://www.u2wanderer.org/disco/songe.html you get the following:
Studio Version (3:47)
Biffco Mix (4:21)
Escalation Mix (7:07)
Escalator Mix - See Escalation Mix (7:07)
Influx Remix (4:04)
Paul Van Dyk Mix (7:59)
Paul Van Dyk Non Vox Mix (6:30)
Paul Van Dyk Radio Edit (4:03)
Quincey and Sonance Mix (6:54)
Snippet (0:40)
Tomb Raider Mix (3:39)
Vandit Club Mix (8:54)
Vandit Club Mix - Edit (7:20)
Live in Studio, Dublin, September 2000 (4:10)
Live from Slane Castle, September 1, 2001 (4:06)
Live from Slane Castle, September 1, 2001 (4:59)
Live from Chicago, May 2005 (4:34)
Live from Milan, July 2005 (5:52)
That's been the whole purpose of the 'By Songs' list that initially started the discography back in 1995...to catalog all the official audio tracks. And it's one part of the discography that is maintained and quite up to date, only lagging about a few months behind I believe...Artificial Horizon is in there...