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QA1 Rear Pro Coilover Kit - Double Adjustable, 200 lbs/in Rate - 1978-1981 Pontiac Catalina C-Class 2017 Mazda 3 2QA1 offers bolt in Rear Coil Over Conversion Kits for the 1978 1981 Pontiac Catalina. These kits include specially designed USA made mounting brackets and single or double adjustable Aluminum Shocks, springs and all necessary hardware. Single Adjustable Shocks provide 18 positions of simultaneous rebound and compression adjustment while QA1's double Adjustable Shocks provide 18 positions of compression adjustment and 18 positions of rebound