Is there an aftermarket stone or deflector plate for visions grills? I have the large stone and have had it for about a year or two. I went out side and was having trouble with a new lump charcoal holding temp and removed the lava stone and noticed is is cracked halfway across the stone. I would much rather have something that is longer so the ends of ribs or brisket don’t get burnt. Is there something else out there? I see aftermarket or other offerings for other manufactures but not much for the Vision.