WOW, that is a beautiful Cobra and you should be proud of it. I really like the color. As for the 15" tires, good ones are getting harder to find around here and I went to the 17" wheels for that reason, but you can still find good 15" tires if you can find the right place to look. Congratulations on a great car and you will have enough fun with it to make up for any questions.
Ron