newtakeoff.com, or try seller 'cascotech' on ebay

I cant recall who I got my spares from, but it was on Ebay, and in ypsilanti michigan. they had spoilers too. pretty sure takeoff spoilers are 80 bucks in whatever color you want-

might want to check over at themustangsource dot com, as there seems to me to be more GT guys opting for spoiler delete- she might be able to trade her lid for a spoiler equipped lid and even make a couple bucks...even trade at minimum- just need to find someone local enough to meet up for a swap.

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Confidence: that feeling you have just before you realize the mess you've gotten yourself into...
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