These are a dealer item and are still stocked. I've replaced all of mine on to trucks. They can also be ordered through the company that does the "help section" items at most auotparts stores. The company is Motormite.
Its a dealership part
Check eBay for the plastic linkage bushings. They are not available from the Ford dealers.
The linkage bushings are worn/missing/broken or the wiper arms are not timed properly to the wiper transmissions.
You don't really, you would replace the entire linkage. Best place to get it from and be correct the first time would be your dealer.
Rockauto.com has them and so does O'Reilly's auto parts A Chrysler dealer should be able to get them.
The wiper linkage is bad. Or the wiper arm stud bushings (where the arms attach to the cowl) are rotted out.
Linkage bushings on wiper arms coming off back side of wiper motor under cowling
You have to remove the linkage from the wiper motor.
If only one wiper is working then you have a linkage problem. There is an arm that runs from one side to the other. It has bushings that wear out. You can also have a stripped spline where the wiper arm hooks up.
The linkage is connected by plastic bushings and with age they deterioate.
If one wants to replace a wiper linkage there are a few steps involved. Pull the wiper arm away from the windshield until the arm locks in vertical position. Unbolt the nut that holds the wiper arm to the linkage and pull the wiper arm off the linkage. Open the hood and unbolt the wiper motor and slide the motor off of the linkage. One then will remove the wiper linkage and install a new one.
how do i repair 1997 nissan maxima wiper linkage