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Original 1968-1972 Corvette headlight bezels were cast aluminum; 1973-1982 bezels were SMC fiberglass.
Thanks and good to know!
BTW, I do know my TIG welder could weld repair the cracks in my 72 aluminum headlight support. However, he could not weld repair the crack in the 72 original metal headlight bezel. So we concluded the bezel must be made from a lessor quality aluminum or lessor purity.