Well, guess what, thanks to local Vancouverite and fellow FitFreak.net member Mugen_Dom, we now know that the cargo light from the new Acura RDX, as well as the 2007+ MDX, is a direct plug-and-play replacement for the Fit.
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Installation is very straight forward. Use a flathead screwdriver and pry the existing unit off the car; You'll see where you should insert the screwdriver blade. Unplug the light module, and replace with RDX module, then put the new light back in the car. Part number for the RDX light is 34265-SFE-003, and the list price is US$12.30.
Photo by Robert Gold