P1TOOLS Heavy-Duty Round Rubber Coil Spring Spacer for Car,Universal Coil Spring Booster 2 Pack

perfect for GM

Outstanding product. Simple, Relatively easy to install (use soapy water and pry bar) and really helped a soft front suspension on my 2nd Gen Tundra. I bought these specifically for handling a Western Midweight plow and although it isn't plow season yet, these have really helped stiffen up the front end a lot. Best 60 bucks ever spent on my truck. Don't buy the outrageously overpriced Sumo Springs, these cheap amazon ones will serve you just as well.

I have a Honda Civic that is pushing 10 years old so my rear springs were getting a bit weak to where my rear tires were not aligned properly. Adding a set of these spring boosters totally did the trick. Very happy with the results.

Well made and durable fit like a glove

Had a hard time, putting them in, had to take loose the lower control arm and the shock to let the spring open up also sprayed wd40 on the rubber to help it slide in.