There seems to be at least 2 popular options. Mine is probably the least popular of the 2 but I like it better on my bike. There is the 4.5" light that I have and then the 5 3/4" that some have used. Either will fit. Depends on the look you want.

 

I put the 7" Fat Boy one on mine, bolted right on

WillieC

 

I took out the rubber mounting inside the case and mounted a Deuce headlight on my Wide Glide. Pretty sure you can get a lamp that isn't intended for domestic use that would be suitable. Here's the DWG with the light.



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