SMART Car Seats like this you mean
I got these a few weeks ago, haven't posted details due to lack of time. They're 46cms wide, 3cm narrower than the Alto seats I posted about earlier, and are a good deal lower/thinner. I have looked in some detail and as far as I can tell the current For2 SMART has the same seats, they dont seem to have changed at all. I got mine from a 2008.