I am going to suggest this… run it. I know it looks bad, but on my Duster the spring hanger mounting location on the driver side looks exactly as yours and I too bought reinforcement plates that I didn’t use because of it. Just use washers under the nuts or the original washer intergrated nuts if they are decent, that’s what I did 4 years ago when I installed new springs. I’m only running about 400 horsepower 340 and if you are not drag racing, just spirited driving, should be fine for many years, it took 50 years to look like that today… If you want it perfect you will not get on the road, and if you could see thru it or deflect it by hand… then it’s a hard no, but that will take several more years to be a problem but now you know about it so you can check it once in a while and when ready to dig into it, dig in, otherwise run it and enjoy the car for now.