This is a Genuine OEM Hustler Raptor FlipUp Seat Spring Upgrade Kit, # 123913. Fits all Raptor Flip-Up zero turn mowers. This kit can be bolted under the seat for increased ride comfort. Please have your make and model information ready. Nolts Power Equipment (Formerly Perry Power Equipment) is located at 3720 Shermans Valley Rd, Loysville PA 17047. We are your source for Lawn & Garden Sales and Service.