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its not that piece you really have to worry about it goes around the seat frame and can work with either frame.its the other little part the lower back cushion cover.the top back of the non vent frame goes straight across.the vent frame has a recess for the vents.so the material on the back of the cover is longer so it can snap in place.the pic is of a non vent cover as you can tell it has about a half finger length of material.the one for the vent frame is about 3 inches longer in the back. hope this helps.