Saw these in an Ontario Walmart. Selling as a "healthy oven crisp'r"
They measure 9"x13" which fits quite nice on a Bradley rack. Seem to be made of the same material as a frog mat.
(http://i1335.photobucket.com/albums/w662/bloke6/20141004_151129_zpso7qpstxo.jpg) (http://s1335.photobucket.com/user/bloke6/media/20141004_151129_zpso7qpstxo.jpg.html) (http://i1335.photobucket.com/albums/w662/bloke6/20141004_151144_zpsogbicyot.jpg) (http://s1335.photobucket.com/user/bloke6/media/20141004_151144_zpsogbicyot.jpg.html)
those will be perfect for the Bradley nice find