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Well, if the ball joints are fine, no need to replace the whole thing. Just replace the bushings. Besides there's no difference in performance or handling even if you change to the Supra control arms.
ball joints are unreplaceable so you mine aswell do them now, no telling how long there going to last on a almost 20year old car. and the 97 twin turbo supra arms are made of aluminum versus cast steel which saves 7 pounds in unsprung weight which aids in acceleration, brakeing, and cornering.. read a book