You can move up to the SVT / Cougar size front rotors. Perry did.
Of course, you will either need the late SVT / Cougar caliper brackets or the early SVT calipers and brackets. They seem to fit just fine under all factory 15" wheels.
Just be aware that the mini spare will not fit over the larger brakes so you will need to put the spare on a rear and move the rear tire to the front if you should have a front flat. Maybe we should have let you learn the hard way. Perry did.