Unsure of the name of the arm that is bent, or where to find x2 more of it that aren't bent/broken.

 

Some manufacturers called them stabilizer bars , some called them strut rods.Some referred to them as radius rods.

Depending on age , may try salvage yards. If that rod is deformed, it is a good bet the control arm bushings are worn too.
It most likely threw off the rear alignment..