Our Stock Blinds are exact size widths. Note that the Mounting brackets will add about a 1/4" to the width of the headrail. Currently each blind comes with full, 2 1/2" returns, but we are transitioning to add 5/8" returns too. Please note, if a blind is not 'in stock' it cannot be ordered as stock, thus we recommend ordering stock blinds ahead of time to ensure availability.