I own a 2016 std CT200H. Drive is too harsh for me. Any recommended coil springs and or shocks. Perhaps the Lexus IS or Corolla might help ? I wonder if they would fit though

 

wrong forum, this is LS400 section, but I can help since I've driven a CT200h for a few months.
compared to an LS400 it's definitely much stiffer but nothing overly uncomfortable. why did you get it in the first place if too stiff?

they do make aftermarket coilovers but they will only get stiffer. factory suspension is the softest you can get!
you cannot repurpose shocks/springs from another car since your car has heavy batteries, necessitating a different spring rate than conventional cars.

if you still want to try, the only car I can see that may have similar suspension is the Toyota iM.

 

I actually like the ride in the CT200h. Not soft and floaty.

Similar with our RX450h. We test drove the RX350 and found it to be to floaty and that's why we got the RX450h instead.

Just for comparison........the suspension setup on factory Lexus cars above (INCLUDING the RCF) is still "softer" than for example the factory MB AMG cars.

 

Harshness is relative. I drove a Porsche Cayman and the CT is both quiet and soft in comparison. I used to joke and say I could run over a penny and tell if it was heads or tails with the Porsche, and having an engine in the back seat made sure you didn't fall asleep at the wheel. That said, I do hear a lot of road noise with the CT which is not very Lexus-like. Some of that is because the cabin is relatively (note the "relative" word again) quiet. I'm putting new Michelin Premier A/S tires on this week which should help a lot, at least on decent road surfaces. Suspension is a compromise between comfort and performance and I tend to value performance while my wife prefers comfort making the CT a nice compromise.

 

Check out the tire reviews at TireRack.com We put Continental Extreme Trac tires on after thinking
that the OEM Michelins rode hard and were pleased with the quieter and softer ride. Described as
beings good in snow proved to be true also. Negative review comments regarding short tread life
was accurate as well but not particularly important to us as we only drive 7K miles a year.

 

Tires are your best bet. Going down to a 16" rim would get you a more compliant ride. 15" is also possible, because that was the base rim in Europe.