Bought to replace the stock shock absorbers, initial installation was very easy but ended up having rear bumps when going over bumps. After removing the packaging and checking again, I found a thick washer/wrench that needed to be installed (not on the original shocks) to fit the 2011 Hyundai Sonata Turbo. Now with a washer it makes no noise at all and drives great! Conclusion: Always look at the packaging.