A server rack for supporting a plurality of servers of varying heights includes opposing side walls each including one or more vertical tracks. A first column of holes is disposed in one of the vertical tracks and a second column of holes disposed in a corresponding opposing vertical track of the opposing side wall. A third and fourth column of holes are disposed adjacent to and corresponding to the first column of holes and the second column of holes. A first pair of opposing rails are each disposed on the opposing side walls. Each of the opposing rails are mechanically secured to the one or more vertical tracks at the first and second columns of holes. The first pair of opposing rails are configured to support a first server having a first height. For the first and second columns of holes, the spacing between holes is predefined to accommodate opposing rails to support servers of the first height. For the third and fourth columns of holes, the spacing between holes is predefined to accommodate rails to support servers of a second different height and a different size than the first server.