Wheels-Tires Wheel gap

Hello guys I'm new to this so I had a question I'm currently on SR SPORT PERFORMANCE LOWERING SPRINGS with 17x8 245s in front & 18x10 with 285s in rear for staggered fitment what would be my best choice to fill my wheel gap ! Bigger rear rims ? Bigger rear tire ? Or iv also seen the ebiach Sportline springs those drop it more then mine thanks ?!
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Your options are shorter springs (with the associated increase in firmness and less ground clearance); remove the rear spring isolation rings (a little more drop, less ground clearance...noisy); or, go to a taller tire on the same rim (use a tire calculator to check the effect on your final drive ratio and speedometer, check the crossection width to make sure you have the clearance in the wheel well and in the vicinity of the quad shocks). Alternatively, if the car rides and handles the way you want, leave it be, get used to it, and park it next to a stick height Mustang or 4wd...it'll look in the weeds.
 
What size is that rear tire? It looks a little undersized in terms of aspect ratio.

Stock tire diameter with the 245/45/17 is 25.7". Closest size to original diameter would be a 285/35/18 which will be 25.9" in diameter, so slightly bigger.