I just saw that!! I had my little girl in one recently and really thought it was unsafe as she was arching her back and almost falling out so I stopped using it!!
You can order kit repair free at recall.bumbousa.com i just ordered mine. Comes with a seatbelt
the straps will help keep them in, but will not prevent falls. Even with the strap you will still have to keep them on flat ground....
Here is a link to get the info that you need!!