Do you still have the 235's and how much

Hey quick question. and sorry for sounding stupid.. But im looking at this kit. http://www.ecstuning.com/Volkswagen-...ide/ES2187576/ But im curious how you make sure that the car never goes lower then a certain point.. I want mine to sit kinda like yours did on the white rims where the fender is right at the lip where the tire and rim meet. But i dont know how to make sure that the air set up never drops the car to far and make the rims crush the fenders.