It would be better and cheaper to have custom stripes made by one of the many M/A vinyl vendors than going to the dealership.
You can also go to any local Auto Wrap or sign places and have them installed for much cheaper.
I think you'll be out of luck doing this with OEM stripes. The double centre stripes that come with a short piece (item 2) to go in the hood scoop, as fitted to Coupés and Roadsters, only come in black, silver and red.
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