I just finished another custom part for this 67 Squareback I'm building and I had to share.
The owner wanted the bumper mounted reverse lights removed and these 'functionless' reflectors (just like on a bike) turned into reverse lights.
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I ordered two 3" diameter by 2" tall chunks of acrylic from McMaster-Carr.
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The machine shop turned them into these great lenses based on the drawings I supplied them.
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This VERY VERY bright white LED pack fits inside perfectly.
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Then I bead blasted the inside for an even texture and polished the outside so it will stay clean.
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I'm really psyched about how well these turned out. I was fully expecting more complicated issues.