OK to type all this again... The primary linkage routes from wiper motor pitman arm to left/drivers side pivot. Secondary linkage routes from that pivot back across to right/passengers side pivot. 4 nylon bushings snapped into the linkage arms with steel ball studs snapped into their cupped sides.
You'll pull the instrument panel to access one and center radio/climate controller area to access the other. The factory service manual will help to get'er done.
The bushings can be purchased just about anywhere, HELP line at parts stores, dealerships, ebay, etc..
Now the tricky part... A lot of owners have replaced bushings that failed ( after 30+ years of use ), then their new bushings failed after a year or 2. First thing they do is blame aftermarket bushing quality. The truth is these pivot posts are worn adding much more work load at the bushings. This is especially true for that divers side pivot assembly since it transfers work from motor to other pivot.
I'll point out a difference in mfgrs... Try to buy a bushing for a Honda wiper linkage. In fact,,, go to Dorman catalog and look at wiper linkage bushings. There aint 10 different bushings available. Most mfgrs will offer nothing less than a complete wiper assembly. That's the linkage, bushings, pivot posts, all of it. They fix it once and done for another XX years. Their customers may pay more for a wiper fix but they don't ***** about a half assed fix for the same thing over and over.
We can't buy new pivot post assemblies for our A-body but we can service the OEM pivots while we are in there.
I did completely rebuild the wiper pivots in my 67 fish. I wont go into the how and all about what was involved. The basic grease and seal kits can make a huge difference in wiper operation and the bushing life. They aint all as worn as those in my 67 that lived in Seattle for 40 years.
Just 1 tip... If you decide to service the pivots, first mark the bottom of the pot metal housing with a sharpie. Rotate them 180 degrees at reinstall. This moves the load to a less worn side of the bronze bushings inside.