I really can't tell you if those will fall apart, I've never owned them. But you generally get what you pay for. My headlights were old and the lenses were scratched and fogged, so I bought nice new Eurospec Ellipsoid projector headlights. They were quite pricey, but worth every penny.
I don't know the exact diameter of mine, but I can tell those are smaller because they don't fill up the housing like they do mine.
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