Control arm bushing question

Hi I am getting ready to tighten up my frontend before I get it lined up this spring. So I bought new ball joints upper and lower, Tie rod ends are good. I need upper control arm bushings as well as lower. I bought a kit of uppers already and here is a pic. But what I am not sure is if these are for both sides or do I need to buy another set for the other side (not sure if you use 2 or 4 per side) and I didn't tear anything apart yet.
Thanks
Paul