It' actually an '88 XR-7 with a 5.0 V8

What is your question?

In the Hayne's repair manual for this car it says that the lower ball joints aren't replacable and that the entire lower arm will need to be replaced! I went to 2 different auto parts stores and neither of them have the L.A. assembly BUT they both sell just the ball joints!! Am I about to waste my money by buying them??