Fender top turn signals mounting issue! 67 Chrysler 300, What am I missing?

All: finalizing some wiring issues and attempting to mount the fender top turn signals. I have the wiring with the triangular amber lenses, and the chrome top, but it seems like there should be a small plate that goes on the inside of the fender to hold everything together? Anyone have any photos of this or am I doing something wrong? Appreciate any thoughts. C Shaft

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Author: Camshaft