Turn Signal Titanium Bulbs

I've seen Grand Prix's with Titanium Turn Signal bulbs that have a titanium mirror finish but whe light up are the legal amber. Does anyone know where I can buy a set of there and what part number to use? I've looked at A&A Auto Parts and they told me my part number was 3357 and they dont make titanium bubls with that number. Can I use different part number?Any help would be greatly apprecated.

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