what size slick to get, that will fit under a mustang with stock suspension

[Foxfan88]

i got 2 15x8.5 wheels i plan to use for track rims
i get all confused when i look at slicks, they measure it in inches as opposed to millimeters like reagular old radials.

so whats a good sized slick to slap under my car for the track.

 

[25thmustang]

I run 26x9 Hoosiers, as you can see in my avatar. Have them mounted on 15x8 Draglites, and they fit fine, and hook well.