hello .....i picked up 3 hearthstone II parts stoves so i can fix the one i'm planning on burning in. one of them came with what looks to me like a coal burning firebox and stoker, or shaker grate, along with a heavy wall firebox, sidewalls and such. trying to make heads or tails of it. i have a parts breakdown i found online for the stove, but it does not show the optional coal setup. i've attached a couple pics of what i have, and was hoping someone knows something about it, because i can't find anything online about it.