When I did mine, the old ( original ) window frame was badly rusted, but I was able to get the angled pieces out. The new frame I purchased ( Carter ) came with new angle bars, that were slightly more bent than the originals. I opted to reinstall the old bars as I was sure they would fit correctly. They angle the frame to match the cab evenly. Outside corners fit a little on the loose side, however, with a good flexible gasket ( Steeles Rubber ), its 98% weathertight. I have seen a few '46's with cam type handles on the inside "A" pillar, which pull the frame tight, and appear to be a stock item ?
