I know this is a old thread but I would HIGHLY recommend you check out Eaton Detroit Spring: https://www.eatondetroitspring.com/ you give them how your car is spec'd out (engine, accessories, etc. for weight reasons) and what stance you want (I went 1" lower in the front and 2" in the rear) and they will build the coils and leafs to meet your needs. If you go with anyone else it's pretty much a one size fits all recipe except for the coilovers which are adjustable.