heres what I found on google:
The boots have a very tight fit with TD1 (regular) bindings, and may need dremelling. Some older UPS boots, and the larger sizes of the UPZ boots, are also not compatible with the TD1 step-ins because of the boot geometry. But there are no problems with Catek.
and the boots I bought:
UPS Alp Free: 2 buckles in front, and one on the back of the cuff, plus a Velcro strap that spans only the front of the shell.
heres a pic, http://www.bomberonline.com/vbulletin/showthread.php?t=28775
anybody know?