Mount - Upper Spray Arm Part Number8539324 Manufacturer/BrandWhirlpool Corporation Availability In stock. Price $5.03 Getting product avaibility Product Description Details Dishwasher upper spray arm mount. The original screw and mount are no longer needed this will attach directly to the rack Whirlpool 8539324Remove upper rack. The mount is located on the underside of the upper rack. Snaps in place.