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This item is for a set of four rear strut rod bushings (RSRB) to replace both sides of your car. SCP has created exact duplicates of the Ford E9SZ-3A140-A and E9SZ-3A140-B bushings. You get two of each. The bushings are marked with a "F" or "R" (Front/Rear) for their location relative to the lower control arm.
The rear strut rod bushings often go bad after 60,000 to 80,000 miles and result in a clunking sensation in your front end when going over bumps.
If you are changing out your lower control arm then I would DEFINITELY change the RSRBs as the strut rod goes directly through the lower control arm and these bushings support it at that point. Why put worn out bushings back in the car when these are a known high wear item?
PLEASE NOTE there are RSRBs available in the aftermarket using thermoplastic material from Moog, AC Delco, Mevotech, Quick Steer, SKP and likely other sources and I have one thing to say about them. DON'T BUY THEM! THEY ARE JUNK and will not perform as expected! You will be lucky if they last 12 months of normal driving. Ours are OEM Ford quality and will last 15+ years like your originals did!