Do I need to get new bushings or anything or can i just bolt it on with what i got?
You’ll need new bushings. You are going from 13mm to 21mm. The bushings are significantly bigger and they are a PIA to get put into place.
the trick here is not to jack up the rear wheels when installing it - make sure the car is resting on its weight - installation will be a lot easier. also, if you’re using urethane frame mount bushings, make sure you grease them between the bar and the bushing surface. don’t lube the end links tho…
rob