Leviton® provides different types of unpopulated plastic mounting brackets to accommodate the installer's need for custom mounting solutions within Leviton® series 140, 280 and 420 Structured Media® centers. Leviton® expansion plastic bracket is a full width bracket that can be populated with up to five Leviton® phone, data, security or DSL filter expansion boards to meet custom application needs. Expansion plastic bracket for mounting up to five Leviton® phone, data, security or DSL filter expansion boards in a Leviton® series 140, 280 or 420 Structured Media® center.