lateral links

I am redoing the suspension in the rear of my P5 and need to replace the rear lateral links. Are all 4 identical to each other? On Rockauto there are several different brands and i am not sure what parts to order. I know there is a difference with the in the length if you have drum brakes which...

So I went for an alignment the other day and the tech told me that I could use new bushings and that I needed a both rear lateral links because they are bent (see photos below). Can you guys give me the part numbers for the bushings and let me know if any company makes them stiffer? I think I...