on some of these fans the stem is wider than the originals. the triangle fits in an area so its placed perfectly, but if the stem of your ace is wider than the slot it fits in, you have to file it down and tie wrap it to attach it properly... i did not have a problem with my 59's its the 58's that would not accept the wider stem...let me post a few pics in a couple of minutes...
EDIT: Looks like these fans don't have heatshrink on their wires.