I have same problem with my 2010 Highlander. I thought that I might be able to switch the back seat head rests, but the distance between the posts is different. My daughter-in-law has a sienna and she had to remove the rear seat headrests to accomodate the child seats. Suprisingly, these head rests are perfect for me! I checked the wholesale price for them and unfortunately, new ones would be very expensive