RackSolutions 2Post conversion brackets one key issue with 2Post racks, mounting 4Post equipment. Rather than purchasing a 4Post rack for only a few pieces of equipment, conversion brackets allow 4Post equipment such as servers using 4Post rail kits to be mounted in a 2Post rack. The 2Post conversion brackets essentially convert a small amount of space in your 2Post rack into a 4Post rack. Coupled together, the brackets can convert as much of the 2Post rack as needed. The brackets are sold in individual packs, so 4 brackets must be purchased to mount one piece of 4Post equipment in the rack.