Wheel alinement front on 2002mercury couger v/6 2door

It’s best to have an alignment shop set it up, that way they can get the camber, caster and toe set correctly.

Answer not posting

Yes, you should a wheel alignment done since you replaced the control arms. Take the car to a garage that has the proper equipment.

I've used string to run 2 parallel lines , attach to the caliper then from the back of the tire go forward measure at the bumper and about 8' out to get parallel lines . The ancient builders did amazing things without computers or lasers .