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I have not seen replacement lenses for the R3, but it is not hard to make them. I have made lenses for vintage bikes and cars where they are no longer available.
Most hobby supply stores carry acrylic molding supplies - mold materials and liquid acrylic resin. You can even purchase dyes in various colors.
Take off the lens, make a mold of the back side (or a two pice mold of both sides), and pour in the resin, tap to release air in the resin, let cure.
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