In my 88 300TE wagon, two of the seatbelts "receivers" are connected through the rear seat AFAICT (one for the back-seat and one for the 3rd seat) by a rubber doo-hicky. Said rubber part is broken, which makes it so that the receivers fall to the floor whenever the seats are moved down. It looks like it'd be easy to replace the part, but I can't find it online, in part because I have no idea what it's called. Does anyone know?