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If you insist on clear corners, it does sound like a lot of work, but I bet you can home-make a side marker fairly easy(just cut up a clear signal lamp and use that)When applied to tail lights, fog lights or turn indicators, VHT Nite-Shades™ appears black until they are lit, then the natural red color appears.
Maybe he will chime in? There surely has to be some "old stock" out there.4.0B2 has a set on his bronco ask him.