Get FMS upper arms there cheap and the least binding of any upper you can buy. Also for the lower rears get something with a spherical bearing on the axle end and a multi-piece (3-piece) poly bushing on the chassis end. Badly setup upper/lower arms with wrong (overly stiff) bushings may seem to improve handling but near the limits it they will cause the suspension to bind causing a very unstable situation. Not to mention that binding can cause damage to your torque boxes etc. Lots of the hard poly stuff is great for the drag racers but you want handling so whats mentioned is what you need. Dont skimp out on the lowers, it's sucks to spend time and money to do a job twice.