Hard hitting bumps & noise over bumps coming from side where strut was replaced.

What is your question?

After I had a strut put on, I started feeling bumps through the floor when I go slower than 55 miles per hour. Honestly, it feels like I can feel them through the pedals, and hear them. I never had this problem until I got this strut replaced. I felt this immediately. I have had my car checked out by two locations. One says it's the sway bar link and bushing, but they are not sure because everything is tight. Another dealer says its a bad strut that was just put on the car and I need a new one. Someone else told me to have the engine mounts checked as well. Has anyone else had this problem? Help!