Sachs SG330108-1 Gas Charged Liftgate Lift Support | Chevrolet | GMC 1 Lift Support For the Liftgate. Extended Length from Center Mount to Center Mount is 23.03 in. High Quality Supports, designed to last, to OEM Standards. Includes a Limited Lifetime Warranty! Interchangable with the following OEM Numbers: 20990085,SG330108