Bit of a long shot.
Specifically for older cars with the longer style buckle strap
Child seat Mammas and Pappas Teko car seat.
We bought this seat specifically to go in the back of a MK2 Astra as the seat belt buckles are on a 'long' strap. This seat is supposed to mitigate buckle 'crunch'. Where the tongue can be released from the buckle by the seat in an accident.
The lesser faded 'stuff' is for new born. IIRC the cloth is all machine washable.
Price free to autoshiter.