Hello all, I just had Eibach Prokit Springs and Koni Yellows installed on my vehicle. After installation, I noticed a squeaking noise coming from the rear of the vehicle. It sounds like a rubber squeaking noise from both corners. It occurs when driving, and when going over bumps. The tech at the shop where I had the car aligned sez its the rear lower control arm bushings. Just wanted to check with you guys. Should I replace both bushings? How about shock mounts?

Thanks