I'm planning on running one of those two widths on my hatch - currently have bought 275s to test fit width before I buy a wheel and it'll be a challenge if not impossible.
That being said - Broadfield has lots of experience with really wide tires on factory rear fenders (rolled and pulled in various stages) on his S13 -->
https://broadfield.wordpress.com/catego ... ls-brakes/
"WedsSports TC-005’s 18×8.5 +32 245/40 and 18×10 +44 275/35 Very high ride height"
"Work Meister S1-2P’s 18×8 +32 235/40 and 18×9.5 +44 265/35. A little lower on Cusco Zero 2E coilovers."
"Work VS-KF’s 18×8 +21 225/40 and 18×10 +20 265/35. Lower again on modified Cusco Zero 2E’s and a 25mm rear pull"
"Work Meister S1-3P’s 18×9.5 +12 245/35 and 18×11 +30 285/30. Lower yet on Stance GR+ coilovers. +20mm ChargeSpeed wide front fenders and same 25mm pull"