The UCA will have the bushings in place and the ball joint too. Some come with the nuts for the ball joints.
You just need the sway bar bushings.
The epc is down again.
But this one is working:
Mercedes-Benz Teilekatalog (Ersatzteile online) / 123.153 - 300 CD TURBODIESEL USA
There are lower bushings made for fleet vehicles, may be the same as the 126 parts listed.