If you were fitting the original 15 inch wheels then the 282mm discs fit fine (I use this set up). I cannot say for sure for aftermarket wheels however as it will depend on the shape of the wheel.
If you simply unbolt the old caliper and carrier and bolt on the new one (without changing the disc) you should be able to see if the wheel will clear the caliper once you refit it (you obviously can't drive it like this but it is a lot easier than changing the discs to find it doesn't fit!).
can u clarify
do u talk about
OR 15 inches alloy wheels there is a difference.