If your front control arms are bent, chances are that the front struts are on their way out too (from curb hopping or otherwise).
I would suggest you replace all 4 struts. Even if the front ones are ok, they're getting a bit old since your car is a '97. Pairing them up with brand new rears could make the handling funky.
BTW, Bilstein makes the original Boxster struts.
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