JCullen's right, and I should have clarified. The two lift-up grates for refueling are blocked by the new racks. However, the rack fits nicely inside the kettle dome.
The stone, however, works well with making bread and rectangular pizzas. It's convenient to have a platform as most pizza stones have to remain in place until they cool in the kettle.
I wish, though, we Americans has access to the British Weber products. For example, Weber UK has a new pizza stone that is also designed for baking bread in the kettle. There are a whole host of products too, like knives and spice grinders, that are UK-only and no company will ship them (legally) to the States.
Gary