They are mirror images of each other, meaning can be put with fire boxes on same side. Both units have heat and hold feature. Took off mechanics on motor side to fit for removal from previous location. Have not put them back on for ease of transport. These are great smokers, just dont work for my current situation. The item "(2) Southern Pride XLR 600 Smokers" is in sale since Sunday, December 10, 2017. This item is in the category "Business & Industrial\Restaurant & Catering\Commercial Kitchen Equipment\Cooking & Warming Equipment\Outdoor Barbecue & Smokers". The seller is "scot_elle" and is located in Folsom, California. This item can't be shipped, the buyer must pick up the item.