I would ask this over on the Citabria forum, but cannot remember my password. They are blocking any new password, because I am already in use. What a friendly group!
Anyway, we want to make a 7ECA night flight worthy, and need an approved beacon or strobe location. The Whelen wingtips are on the type cert, and that is an expensive option, but a single strobe or beacon would have to get the rectangular hangar test - and after reading the 43-13 description of how to do that, I just know the labor would be about triple the cost of the Whelen strobes.
This is no doubt the same problem that a Cub would have - is the Cub approved for a single fuselage mounted beacon? Is that ugly thing on top of the rudder compliant with that incredibly hard to understand shadow test?