You might want to think about exchangeing the whole rear control arm with a used one. I did so on my 84 300D at a delivered by UPS from a local junk yard for $153. The car has been on the road for 2 months now with no problems. Changing the control arm was not a difficult job. I took a chance on a used arm but so far it has worked out for me and I got the car on the road fast.