I have an older original Oklahoma joe longhorn offset smoker. I was looking around the horizon smoker website & found that they make a diffuser for Oklahoma joe smokers. near the firebox the plate has holes that graduate in size the farther the they get from the firebox. I was at a local restaurant supply house & they have 18" x 26" heavy aluminum baking sheets with & without holes ( 3/16"). i'm thinking about getting a perforated sheet for next to the firebox & a solid sheet at the exhaust end. any thoughts?