I took the manual steering box out of my camaro and bought an APR power steering box. I quickly learned that the steering coupler doesn't fit off of the manual steering box, so I'm waiting on a new one for the larger shaft power steering box. Do I need to get a new pitman arm to fit the power steering, or will the old one work? Right now it's stuck on the old box, and I was wondering if I should just order a new one? And if so... does it have to be for power steering or are they interchangeable?