I recommend heading over here and using the search feature to search for posts that mention your car models.
I have the Diono Radian RF in a 2007 Corolla. It fits, but your DH would probably be very uncomfortable sitting in the seat in front of it. The Radian is notoriously difficult to install, but we figured it out after a couple of hours. If you want an easy to install seat, the Peg Perego Primo Viaggio is supposed to be one of the easiest.
We ended up buying several seats off Amazon to test the fit because we couldn't find them in person within 100 miles of us. For the seat we returned, all we had to do was print out a return address label and drop it off at a UPS store. It was really easy if you buy a seat that's actually sold by Amazon and not a 3rd party store.