We have had a few discussions here about chopped tops and the cab corner windows. I just found a place that makes new windows for the 47-55 AD. They make stock as well as cut ones to your specicitations.

The cab corners are 150.00 a pair and it runs about 250.00 to make them for chopped tops.
Here is the site:

1948 Chevy Pickup
Chopped and sectioned
owned since 1974 when I was 15.