Toyota Prius and Infant Car Seats for Twins

We have a Toyota Prius 2005. It used to be my "baby" - well, now I have 2 real babies so it can't be my baby anymore.
Anyway, I was thinking all along it will be just as easy as buying 2 car seats. I hate to buy everything new especially if it's not going to be used for long time, so I ended up purchasing two used Graco SnugRide seats, after making sure that there is no recall for this model in the last few years.
Both seats fit well in the car so I was happy all along.

And then came our preemies. Born at 35 weeks, admitted right into the NICU of El Camino Hospital in Mountain View, CA. After the amazing work the nurses and doctors are doing there, it came closer to the car seat test they need to perform there before the babies are leaving the NICU. I then realized that small babies require an adult next to them - sitting in the back seat.
Unfortunately, while the Graco SnugRide offers a great combination of price, ease-of-use and safety, it does that with a very wide base. Take 2 of those, and you won't find a place for any adult I know off (maybe except Naomi Campbell or any one else of her type) in the back seat of a Prius.

Final solution - Peg Perego Primo, the most narrow I could find. One like that, and a SnugRide, and my wife can already fit in. Still considering replacing the other one - just another benefit of buying a used seat for $35, instead of spending $200+.

Beware of recalls though - the Peg Perego had a few in 2001-2002.