Ambient Light Sensor Filter

Is the ambient light sensor filter really necessary for the 6s??

From searching around, it seems it's best to have it.

I have a black screen that was shattered in that area and the filter is missing.

I'm thinking of putting on a 5s filter but it is much smaller than the 6s filter.

Can't find anywhere to buy these filters, eBay etc.

Anybody have any ideas or suggestions?

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