You can buy "tail light tape" that is specifically made to be used for re-creating broken light lenses. They have it on the shelf at Walmart (and probably everywhere else): Works pretty well.
tail light tape
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Used some on my wife’s Buick.
She backed into something and broke the red lens.
Well, you can’t buy a lens, it’s the whole light. $100+ from GM, about half that on the ‘used’ market.
Pieced it together, used red lens tape and good to go.