I'm using the WSM stacker for the first time. I thought I'd share. It fits perfectly and seems to be cooking just the same as it has without it. Well worth the $60 if you already have the 18.5 and need extra space every once in a while.
[B]KCBS, Certified Judge# 59992[/B]
[B]Cook Team[/B] @ [URL="http://WolfCandyBBQ.com"]WolfCandyBBQ.com[/URL]
[B]Web Designer[/B] @ [URL="http://barbecuewebsites.com"]BarbecueWebsites.com[/URL]