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QA1 Front Pro Coilover Kit - Single Adjustable, Large Tapered Flat End, 750 lbs/in Rate - 1963-1965 Buick Riviera F87 2014 Lexus IS350QA1 now has GM Pro Coil Systems available for your 1963 1965 Buick Riviera. They offer fully adjustable ride height and valving control. Pick your spring rate and adjustability to fit your driving style, adjust the valving to match and you are on your way. They also utilize a fully threaded body that allows you to adjust your ride height for the perfect stance or to finely tune the weight balance for superior handling. Specially designed for QA1's Pro