tire setup question

[Rellik27]

im running 16's in the back and 15's in the front.the reason why is i had to make space in my storage, so i changed the rear to 5 lug and put some 16s in the rear since they were taking up space.since now im staggered, i would like to know what i should run in the rear. the fronts are 205/60 and the rear i have 2 diff. sizes 245/50 and i forgot the other one. i cant drive my car for **** right now lol. so would 205/60 go good with 245/50 or not. if not what should i get for the rear? thanks in advance any help is appreciated

edit: the fronts are the se wheels and the rears came off a 1994 3000gt
Modified by Rellik27 at 2:53 PM 7/5/2007

[gumby74]

I cant imagine the rears being wider than 8" so I would wave bye bye to Mustang land.A more appropriate size would be a 225/50. Tried and true.