[Bill E]

raoul as I recall the rear upper arms are from a 90's T Bird. It sounds like you have them from a mustang. Jack the rear up and take out the springs and shocks . Then jack the car up so that the rear lower control arms are headed up from the rear end to the frame at 2% with the uppers disconnected and the snout of the dif supported. measure between the mount holes for the uppers and that will tell you what is going on. your lower arms will have a slight pinch to install them, but should not be moor than half the bushing with misaligned before insulation. Hope this helps