I know they are in MI, but can't be more specific.
PM Spydermike or BBQBubba. They ARE GLBBQSC and they've both always been very helpful to me with any questions I have. OR you could use the "contact us" email option on the website. They've also always promptly replied to that to me before.
Those guys ROCK!
18.5", 22.5" OTS
Large BGE (chambersuac's)
The Fiery Furnace (chambersuac's)
Big JT's Smokin' BBQ Competition Team