Black07gt

hi guys, i need help! i want to get new wheels on the back. i have been thinking of just leaving my front original rims and just putting the same rims on the back just a little wider. i want 17x10.5 on the back i saw them on this link: http://www.cruizinconceptswholesale....od=CCBWB1710-5 however they only offer these for 99-04 mustangs. does anyone know of there will be any problem if i put them on my 07 gt? i need help ASAP please!!! i am on 2 spares right now hehe :$