Heres a quote from the listing "I am selling my drag slicks already mounted on a set of racing rims. never been used, both sets brand new. Have never even been on my car to see what they look like. they are 26 x 10 x 15 with backspacing at 4.50. asking 550, if I have to ship I am asking for 600 and I will take care of the shipping and if local i will go lower than 550. thank you "
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08 Mustang Saleen 3-Valve
NEW BMR UCA 05+ for sale
http://www.mustangforums.com/m_5235895/mpage_1/key_/tm.htm#5246374
I think they will fit, but what is the lug pattern? Stangs are 5x4.5". Check your existing dimensions of tires and back-spacing of rear wheel to confirm off-set.
It would be best to confirm back-spacing of your existing wheels, as I believe it is nearer to 5.5" (could be wrong) This will help you determine if the new slicks will rub on the inside-back wall of fender. Remember the clearance will be less when axle is articulated when going over a bump at an angle.
Jazzer
NOTE: Be careful on Craigs List. There are a HUGE amount of flakes, losers as the site is free to list so attracts them like flies.