Call Strange and talk to them when you order them, tey come with instructions on how to set the ride hieght and they will help you select the correct spring. I have three sets of springs, brands unknown to me , they all have a thin metal tag wrapped around a coil with the rate embossed on it
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
, they all have a thin metal tag wrapped around a coil with the rate embossed on it 
