I have the Mazda 5 and I was able to fit two boosters in the back snuggly. Also it's cheap. Not kidding. I bought mine new in 06 and if this thing ever decides to meet Jesus I'm getting another one. I've had no problems. Again it was CHEAP! Used is even cheaper. I will say it's not my favorite car but I find it easier to use with kids than a bigger van.
So, is the 2006 a minivan? The pics online look different than the new ones. is it taller?