Hi, of course you have to renew everything if it has over 100000 miles and I can tell you from my experience and what I know from other riders who ride Supra, so.... my supra is year 1995, I bought the original Bilstein dampers as Toyota used to install them in the factory in Japan, so Bilstein left the original springs in and I'm super happy with them
A friend drives HKS hyper Max, is also quite satisfied, but you should always consider that you should never take a cheap suspension and then the next question is can I lower the car at all, which is not even possible for me due to the front lip....., so think carefully about what you decide on and I would always fall back on the experience of SRD Tuning and Garage Whifbitz