no they wont.
I had a saxo vts with 284mm brakes and they just fit any bigger and it's 16"s. I know it's a different car but maths is the same for anything.
not if your running dinky wilwood calipers etc.
and saxos run high offsets, meaning the caliper will sit closer to the wheel sopkes etc.
so no, maths isnt always the same.
15" Compomotive mo's will fit over 312brakes iirc.