New Port did reply to my email and confirm that the wiper motor mounting bracket that is in my panel truck (offset to driver's side) is the one that they typically see in the trucks and their system is designed for this bracket. So that makes the 12v electric conversion a bit easier.
I still don't understand which trucks have the center bracket as shown in the manual. The assy manual shows an LD and RD model. Not sure what differs between these two designators. Light Duty/Regular Duty, Left Drive/Right Drive.... I have no clue, but I thought I'd close out this post so if someone goes down the same rabbit hole then they will know the conclusion.


1949 Chevy Panel Truck
A Project Journal
I'm old but I make up for it by being immature.