So closed my hood the other day and the driver side lens (glass part only) popped off the fog light hosing onto the floor. It did not break and wondering how the re-install so it does not fall off again. There does not appear to be any clip or retainer to hold it on.
I believe they are glued on from the factory. I don’t know what kind of adhesive they used, but considering how many I’ve seen missing the glass faces it must not be that great.
My gut feeling is to clean up both sides as well as you can, then I’d consider a clear epoxy or silicon.