Gas Springs and Dampers We also offer free engineering services to help you optimize your choice of hardware. Note to our customers: the GS gas spring line (chrome-plated rods) is no longer available and has been replaced with our GSNI gas springs (black nitride rods). Please check the GSNI gas spring section on this site for GS replacement parts. Example: Old Part number: SPD-GS-2300-60 New Part number: GSNI-2300-60