A Tower to Rack Conversion Kit is a product that is used to convert a Tower Server into a Rackmount Server. This Kit typically contains a set of slide rails and a replacement front faceplate and bezel. The differences between the faceplates and bezels are largely cosmetic. Any text or manufacturers logos will be oriented for readability.
The functional differences between the Tower and Rackmount assemblies is the Rackmount version will usually have a pair of pull loops or handles on the sides to aid in sliding the server out of the rack. The Rackmount version will also have a method of locking the server into the rack. This method can vary from simple thumbscrews to various locking mechanisms.