Hi, all I don't know if this will help anyone.. when I order springs from Detroit - Eaton thru George Riehl, I always ask George to order me a set of springs with a higher spring rate than original. One step heavier-duty than stock. This has worked out very nicely for me with the last two sets, one on a 300F and one on a 300G. The difference in ride is not noticeable to me. It allows me to carry a little more "junk" in the trunk. I feel the car is maybe a little stiffer, but not alarmingly or objectionably so. I feel the cars corner better, handle better, and perhaps these springs won't "sag" as quick either over a few years. On my 300L, George ordered me some extra-extra-extra-extra heavy duty springs, since I planned on using the car for pulling a car trailer. Which it has done very happily for the past 3 years and 30,000 miles. I wanted to be able to place quite a bit of tongue weight on the trailer and not have the rear bumper scrape the ground. That worked out better than I expected. And, the ride is very pleasant, loaded or unloaded. ! On all these cars, the ride height is perfect. John