I have one of these for the 48-53. looks like a good kit, and very adaptable for location and fit.
http://www.specialtypowerwindows.com/products/2

However I have not installed it, you're welcome to come check it out in the box.

In my research it seemed like the most robust and best aftermarket electric wiper option.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-