I think you want a 1422550-12 if your aircraft S/N is up to 337-0379 or 1422550-20, which is the more current number. But it's for the entire lamp assembly, and there's no P/N for just the lens. See figure below. Shouldn't be hard to find from yards that disassemble aircraft. Try Don Nieser first at 405-503-4686 or 405-722-4079.
Ernie
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