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I bought my clear signals from StangMods as well, they've been 100% so far. I wouldn't hesitate about buying those for a second. The eBay ones I've heard can be hit or miss, so personally I'd just go with StangMods.
Remember to buy stealth bulbs for your signal lenses, and don't buy the lenses with the amber inserts in them, those take away from the clean-ness of the look.