I have question for you. I recently saw the A Day Without Me 7 inch vinyl in a shop. It has the following catlog number: "CBS 8905X". On www.u2wanderer.org it says that this single was the first release, but other singles from U2's early years with an 'X' at the end, are re-releases for the "U2 pacs". I collect all the first released singles, thus can anyone tell me if this is a real first released single?