Here's a pic of my 285mm cossie setup:



You'll see there is plenty of room for the disks, the issue you'll have with anything bigger than this is clearance for the caliper. As luke19790_3 said though, you can skim some Mondeo calipers to fit, up to you if it's worth the hassle. I'd just fit the cossie 4 pots if you already plan to fit them.

Lee