Which part is no 1061670 for ford focus suspension?

Garage invoice states 30.65 sterling price for set of 2

It is a rear arm bushing. The rear arm holds the wheel assembly in place (that would be the wheel, brakes, and all related parts). It is dampered by a spring and a shock absorber. The bushing keeps the metal parts of the arm from rubbing against the bolt or pin that holds the arm to the body of the car.
Here is a picture of the rear suspension. That big long thing that's holding the spring onto the bottom of the car? That's the control arm. Your suspension bushing is part of that.

Which part is no 1061670 for ford focus suspension