I replaced all four of mine (back then front) back in August. I did the TRW in the back, and ran into the same problem. I could not find TRW for the front. I did the EPS with Urethane bushings in the front. So far, so good. I don't drive my car a lot, and it is not a track car.
Couple of tips when replacing: I would recommend replacing the sway bar bushings when you are in there. I did OEM Porsche, and they are not that expensive. The back ones are extremely simple to replace (they don't require the control arms to be out), but the front ones I would definitely do when replacing the control arms.
Also, I put a jack under the wheel to raise it up and get the alignment for the control arm. When doing the front, I had to turn the wheels slightly to get the alignment.
I had the "tar strip" rumbling, and it went away 100%. Good luck.
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