I'm posting this just for closure and for the next dolt trying to do what I am.
I read up on installation, including watching some videos (people actually sit or stand on the seats as they install them to get them snug enough, which i never realized). I was convinced the
Radian was going to fit. I took my car to Albee Baby (Manhattan) and parked out front for 2-3 hours while i went back and forth trying seats. The
Radian was cool in that it folded, had a steel alloy frame, and fit to 80 lbs. but it didn't fit
rear facing at all in my car.
I ended up picking (delivered tomorrow, so will have to verify the install) the
Britax Diplomat. I started by fitting the
Boulevard, and when i discoverd to my very great surprise that it fit, also tried the
Diplomat for the side impact protection. Ironically, I had tried to fit the
Diplomat a couple of months ago before I had done any research at all, but didn't understand how seats were installed so I thought it didn't fit.
I would never have bet in a million years it turned out the way it did. You can only try them out. Each seat reclines differently, which is especially important in
rear facing. Luckily my wife is short and she can ride with the passenger seat all the way forward, so there is room. Otherwise I'm not sure what we would have ended up doing.
Net net: Read up, try them out yourself. If you have a hard to fit car, there is really no other option.
Best of luck, thanks to this board as a resource, esp. Susan.
JPS911
P.S. Next battle: 1995 Porsche 911 cabriolet...any suggestions on which might be a good one to start with?