Trying to buy wheels for my Mustang GT.What should i look for?

look on ebay for mustang wheels would be a good place to start. you didnt say what year you had so i dont know what to tell ya. the fox body cars are 4 lug and the 94 up are 5 lug. but the 05 up have the same bolt pattern but different backspacing / offset. on my 95 gt vert i got 17x8 in the front and 17 x 10.5. but usually when your buying a mustnag set of wheels they already have the right spacing.