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QA1 MOD Series Front Coilover Kit - Double Adjustable, Tapered Pigtail Spring, 650 lbs/in Rate - 1964-1967 Oldsmobile 442 Ascent 2012 Land Rover Range Roverdon't be limited to adjustments! Completely re valve in minutes with the MOD Series Shock. Designed specifically on your 1964 1967 Oldsmobile 442 to meet the demands required by today's high performance drag race and handling pro touring cars, QA1's multi patent pending MOD Series shock will transform the way racers respond to changing track conditions and configurations. The key element to this tunability is QuickTune Technology: dry modular valve