Windshield Wiper parts?

My wife's 1998 Nissan 200sx is having problems with the wipers. When playing around with it, I noticed that the arm that connects the motor to the actual wiper disconnects when you try to use it. To save a bunch of $$$$ I have decided to complete this repair by myself. I have tried to repair this part, but with no luck. I started looking at parts online, but I'm not sure which part to buy. I see two different parts, there is a "wiper linkage" part and there is also a "wiper pivot embly." Are these two the same thing or is there a difference?