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Just get new lights. There are no glass replacements. There are a few types out there. You have the option of getting stock lights, halo's, halo projectors, and semi whistler lights. Search around. There are plenty of us running other headlights.
try a search. it involves sanding with high grit sandpaper then plastic polish, i have money so i just bought new ones, i think mine were far gone. cant fix a crack