(2) 20 inch 100 lbs Gas Charged Lift Supports Pair. Reference numbers: LGP83-200-100, 612301, 612305, 612322. Red Hound Auto high quality gas props and lift supports have been designed to meet or exceed OE specifications. Easy do-it-yourself installation. Note: Replacing a single gas prop is not recommended for doors, hoods, etc. that have more than one prop. Replacing gas props or lift supports in pairs is always a good idea in order to keep the load balanced, maintain even resistance and avoid uneven wear. Undue stress on a single prop over the other results in diminished life for both props.