struts

i just recieved my 3 piece strut set. front and rear upper struts and a lower rear strut. i got the upper struts in fine but i have no idea where the lower rear strut goes. my car is a 1990 integra rs. any help is appriciated.

Strut bars, tie bars, etc. not struts. Strut is the "thing" your springs are mounted to. The lower rear tie goes between the rear lower control arms. You might have problems getting the bolts out due to the cars age, if that's the case then new control arm bolts & bushings will be needed. DO NOT use cheap hardware store bolts.
http://files.automotiveforums.com/gallery/watermark.php?file=3052/35564rear_lower_tie_mount.JPG

well ive got all 3 pieces on my car, the lower one was easy enough to get on but had some trouble trying to get in there. i didnt have to replace the bolts though. thank you for the advice.

now are strut bars really necessary for a car's performance? i have no idea for what they are for, except maybe for drifts or something? can anyone explain?

strut bars help with handling. when taking a corner, the car usually leans to one side. the bars help keep the car level increasing stability. after putting them on i noticed a huge improvment, turns that would push me to one side hardly do anything now.

Upper strut bars provide bracing between the strut towers, preventing movement. Stiffer chassis = better handling. Lower ties do about the same. Upper/lower tie bars DO NOT control body roll, that's what sway bars do.