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Usually the front light uses an integral layer, so you need the same kind.
However there is a big issue with eink. Unlike most screens it's mechanical (each pixel is moving balls in a liquid) and unlike any other screen technology there is a calibration factor marked on panel and entered at the factory. A user can't change it. So the contrast may be poor.
A PW3 will also be due for a new LiPoly cell battery soon.
Better to buy a new one, which need not be a Kindle, because you can use it for DRM removal if it's already registered on Amazon. Use Download for USB transfer. The "serial number" is on your Amazon account. See Calibre and NoDRM plugin (Git).
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