Not too many stick with the 15" wheel tho' so it may not be too much of a problem 16" and 17" rims seem to be more popular on the modified cars.

The mondeo from 00> does have 300mm discs but 5 stud I think.
The Galaxy from 01> has 300mm on 16" rims, and 313mm discs on the V6.

The Peugeot 406 coupe V6 has 305mm
The 605 has 290mm
The 607 309mm
and the 806 has 295mm if that helps