I had bought rear upper control arms (rear alignment kit) off of ebay last august 13th of 2011.
As of last week (on march 6th 2012, about 7 months later) they failed on me, so I have replaced them with ingalls off of summit racing. the ingalls appears to be made 1000x better.
The old ones are on top, the ingalls is on the bottom.
The ingalls was $51 a piece. The ebay ones was $27.88 for two.
Here is some pictures of what happed to the ebay ones.