Where to buy the flashlight glass and how to fix the rear camera frame

Hi,

When I tried to replace my back glass, I happened to take off the back camera frame and also lost the glass covering the LED. Right now I just glue the frame back but seems like it’s not solid enough.

Does anyone know where I can buy the LED glass? (The missing part is shown in the following picture).

And does anyone have any suggestions about how should I fix the back lens & frame elegantly?