Honest to God, your best bet is the older two forward facing and the newborn rear facing in the middle. However, if they're still rear facing and that's important, I suggest the Diono seats. I hear they're super narrow. My brother has a two door cobalt and fits our Cosco Scenera in there just fine forward facing on the side. I bet he could fit two more of those in there, but those aren't a long term solution at all...just a cheap solution if you need time to save for better seats/expensive ones.