Well, time to throw away my cateye tailight. I bought one a year ago, installed it, and now everyone is going that route...
Mine is tucked under the fender though...
Helps that I'm running a Rebel rear fender, more space to hide the light. It will hit the trash too. Going with a full coverage 1930s type instead. Should be on shortly.
Cateye is only fractionally smaller than the stock light for surface area. Run it if you like it.
-WD