the point here is andys car has a 30mm bolt on arch and they ar still too wide, your car has a 50mm flare and they fitted. i am going to stick my neck out and say that 50mm extra is not regular bodywork. lol
also about the 9j thing, it's tyre choice that helps the whole situation not wheel size. i managed to run 9j +6 on the front of my corolla. i had to back space them 15mm or similar (i forget now) to clear the coilovers and they still fit on standard bodywork.
how?
cos i had 185 55 tyres on them. this made the side wall alot more angled and missed the arch. putting 7j reversed wheels on therre wouldn't have fit, because it was the tyre that made the 9j work. the side wall of a 7j flipped with a 185 55 would have sat like andys and just not worked. again i would have needed mega work to get a 7j -25 on the front of a corolla with the tyre choice available.
first pic shows where the 9j sat sith stretched tyre. still a 185 remember. oh plus camber plates push all the way in.
here with over arches, and still the rim face is out.
here is a 7j with a 185 tyre on it. notice how it sits flush with the face?
so if the flipped 7j wheel sat in the same place as your current N2 wheels then there are 2 points to note.
1. to achive the stretch of the 9j i have pictured but on a 7j, you are going to need some very small tyres.
2. jamesAE86 going to need bodywork surgery to fit them, as it is pretty clear that 50mmplus wings that eight-six has are not normal.