from other forum...
This picture above is taken from my site. These are the measurements I used on the yellow 6.0. Only the one arm is doing the driving. Here are some more details for a successful wiper movement.
I used threaded rod for a section of the drive rod so I can adjust the sweep of the pivot lever accurately.

I cut the lever at the pivot and added adjustment via a 1/2" bolt and nuts. This way the wiper sweep distance can be shortened or lengthened.

Parked position

Top Position

1/4" ball joint for the secondary pivot. (adjustable too)

How to correctly position the secondary pivot point.