Well, the small one is 6.5" X 5.25" & the large one is 9.75" X 6.5". I believe the racks on the 008 are 14" x 14", so you should be able to fit two on each rack.
Personally, I don't use popper trays when I make my ABT's. I slice the jalapeno's in half and just lay them directly on the racks.