The QA1 springs made for the Generation F coilovers work fine for the majority of applications, however, if you already have lowering springs or wish to use a custom rate spring, you're out of luck. BMR spring cups can be installed on top of the adjustable shock collar to allow the use of any stock or aftermarket lowering spring. The cups are made out of  laser cut aluminum and have a machined radiused bevel that matches the coil itself. Sold in pairs.BMR shock spacers install between the shock and the shock mount on the A-arm. These can be used to raise the front of the car without adjusting the spring. Each spacer will raise the car 1/2" and can safely be double stacked to gain 1". Made from 6061 T6 aluminum.  Sold in pairs.