Good luck on that. If you can even find a used one it might be expensive. I have seen one made of wood that looked pretty good. May have to do that for my Buck too. It's all busted up.
I have noticed quite a number of Bucks and Beaver IIIs with broken headlight bezels. How much of a job would it be to take a good bezel and have a mold made of it, then duplicated by injection molding process? Vvm