A mounting bracket for an electronics rack having a rack structure defining a plurality of holes spaced along the rack structure to define retma (U) mounting unit increments of the rack. The plurality of holes are spaced along the vertical rack structure in a pattern substantially conforming to an Electronics Industry Association (EIA) standard. The mounting bracket includes a mounting bracket body, a first alignment structure extending from the mounting bracket body, and a second alignment structure extending from the mounting bracket body. The first alignment structure and the second alignment structure each are adapted to engage a hole of the rack structure so as to align the bracket in a position along the rack structure. The first alignment structure and the second alignment structure being spaced apart such that the bracket is alignable along the rack structure both at positions corresponding to whole retma unit increments and at positions corresponding to half retma unit increments. Electronic devices such as computer system servers may be mounted in the rack.