i have the snoozer that fits the whole backseat its perfect for both my babies, i drive a scion tc so i think my seats r pretty low and the snoozer sits high enough. This was a great craigs list find, i bought it off of a wonderful older couple who kept it in great shape origianlly its $153.99 but i got it for $35.00
snoozer:
http://www.snoozer-dog-beds.com/fullbench.jpg Snoozer Dog and Cat Beds, Lookout Perch Dog Car Booster Seat