I've never been able to find this part and have seen at least one other member here say the same. I am talking about the diagonal arm whatever you want to call it, the arm in the rear that houses the wheel bearing, the bushing at the top where it bolts to the rear crossmember.
Fronts are easy to find and it turns out, they fit in the rear just fine. I thought they looked the same and the fronts are easy to find, rockauto, ebay and probably your local auto store as well has them readily available. I had them pressed in today and they are an exact fit. I only have seen them listed as front specific, never seen them listed as rear, so this is good news. You're welcome.