The Cateye ICS mount allows the installation of the Cateye Rapid 5, Rapid 3 and Rapid rear safety light on most Fizik saddles with the ICS feature making it super easy to clip a rear safely light directly to the shell of a Fizik ICS saddle.
A word on sizing. Cateye includes both a short and long mount. Size is dependent on the saddle model and whether you are mounting the Rapid 1,3 or 5. The Rapid 1 works with either the short or long size for most saddles but long only for the Tundra2, Antares or Aliante. The Rapid 3 needs the long for the Aliante and Ardea and either size for all others. The Rapid 5 does not work with the Aliante and requires the long size for most other models although the short mount will work with the Tundra 2 or Gobi.