Abstract: An accessory panel for use in an internal bay of a computer is compatible with at least two disparate types of mounting arrangements for such panels. The accessory panel comprises a face plate, a mounting plate, and a sub-frame. The sub-frame includes a side plate and a rear plate. The mounting plate is fixedly coupled to the face plate. One or more bores are disposed along a surface of the mounting plate. The bores are arranged in a pattern that corresponds to a pattern of mounting-holes on a framework that surrounds a particular type of computer bay. The bores provide a means for mounting the panel in this type of computer bay through the use of fasteners. The side and rear plates are coupled to the mounting plate when the panel is installed in a computer bay that accommodates peripheral devices through the use of mounting rails. Once coupled, the mounting plate and the side plate provide a substantially smooth, coplanar area on which a mounting rail can be disposed.