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QA1 MOD Series Rear Coilover Kit, 200 lbs/in Rate - 1964-1972 Buick Skylark TC 2012 Volkswagen Golf R AWDdon't be limited to adjustments! Completely re valve in minutes with the MOD Series Shock. Designed specifically on your 1964 1972 Buick Skylark 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