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Why is it that you want to go with a 17" wheel (e.g, look or performance-tire availability)?
With a CSX 4000 you might want to stick with the 15" wheels and upgrade to the Avon tires (assuming you like the look of the 15" wheels but are looking for a better 15" tire). The Avons are a very good 15" peformance tire for Cobras (vis-a-vis the limited 15" tire options). I have them on my car, and I am very pleased with them.
Is your car a Hi-Tech or HST-produced car? If Hi-Tech, you should be able to reach out to Barry Bloch (General Manager at Shelby Distribution) and inquire about tire sizes for 17" wheels.
You could also talk with the folks at Shelby Automobiles (e.g., Gary Patterson) regarding 17" tire sizes.
Good luck.
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