I just received my seat wedge pillow and it fits my car seat perfectly! You are the only one I could find that made one in the right size. Everybody else's was too large & wide for a car seat, and others were not rigid foam. I was so excited when I got my new SAAB convertible, but disappointed that the deep bucket seats bothered my back. I envisioned a wedge that fit in the "bucket" to fill it in, and your measurements were just right. Thanks for sending it promptly...I might just need another one for the passenger seat! Thanks!