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I use a piece of #6 stainless steel mesh cut to fit the upper grill / woo3 rig.Available from Amazon. Here is the link:
Stainless Steel 304 Mesh Sheet, #6 x 6, 0.047" Wire Diameter, 52% Open Area, 12" Width x 24" Length
Great for roasting veggies and grilling meatloaf! Got the idea from over on the Weber Smokey Mountain site. Have done this for a couple of years and it works perfect. Cut with metal ships, diagonal cutters or dremel tool as needed.