ash. PartQualifier: US built ash. PartQualifier: US built bisque. Rear Right. Right.FOLDING TYPE. Seat back end. A combination of Seat back bolster cushion, cover and associated components that comprise of the Seat back bolster assembly. A cover used to replace the original equipment Seat back cushion cover of a vehicle’s Seat. Back Cushion Cover. back end. Bolster. Frame. Side support.