Front Left. Latch cover. Left.QUAD CAB. Left.REG & QUAD CAB. VINYL TRIM (TX). A cover used to replace the original equipment seat back cushion cover of a vehicle’s seat. Seat Belt Receptacle Cover. Trim that covers the folding seat latch. Trim that covers the hinge between the seat back and seat bottom. Back Cushion. Belt Receptacle. Hinge. PLATE. Shield.