ppl just use bride rails and they fit on the eastbear ones, havent had a look at the DRIFT seats but i assume it might be the case with these too.
they are ADR approved & come with lifetime warranty on the frame, wow, cant go wrong there.
google DRIFT seats and visit their website for more info
this was the seat i was going to get but instead got a Recaro.
btw, which Autobarn did you go to? cause $449 is a good price, they were $499 when i enquired about them earlier this year.