Abstract: A vehicle seat is mounted on the vehicle body by a seat adjuster which enables movement of the seat relative to the vehicle body to a position chosen by the occupant. A seat belt is anchored on the seat so that the seat belt moves with the seat to the adjusted position. An extensible cylinder extends from the vehicle floor to the seat belt anchor on the seat and extends and retract as necessary to accommodate the adjusting movement of the seat. The extensible cylinder includes a piston movable within a fluid filled chamber and having a flow rate responsive valve associated therewith which permits low flow rate fluid flow through the piston during adjusting movement of the seat so that the cylinder extends and retracts to follow the seat.