Rear Seat removal in Prius 2010

Huh. That happened to me once, but it turned out the white plastic clip had come out of the car floor with the seat when I yoinked it up, and was lying nearby. When I put the clip back together and into the hole, the seat would then clip into it.

If it is in place and still won't clip the seat, my guess would be it's broken, which you can probably see by taking it out and looking. There are two external claws to hold it into the car, and two internal claws to grab the seat.

I think the part number has been posted in this thread, and the price was a few dollars.

-Chap