It was difficult finding a bench cushion whose dimensions would fit my bench, without having to go to an expensive custom cushion.   I found that the deep was not as important as the width.  Took a chance on a cushion that was the right width, but was 2-1/2 " deeper...and it worked.  I like this aqua cushion, because it lightens up my office room, which has 2 dark bookcases and 2 dark file cabinets.  Its aqua color ties in with the paintings on the wall behind.  It also happens to provides visitors with a comfortable place to sit.