There is a little cover in the plastic trim about shoulder high or so. You can pop that off and mount to the metal. I suspect that in the initial design they had it setup where the seatbelts were attached to the B-pillar instead of from the seat. Also, if you look the at little "ledge" and imagine that is where there would be an opening in the top to allow the seatbelt to go through and the seatbelt retractor would be housed below that.
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