!950 1/2 ton window bolts

[snafu1]

Hello, I am helping a friend with a 1950 Chevy 3100 1/2 ton truck. It has 1 piece door windows. His truck had broken windows, so he bought replacements with the sash attached. The problem is the channels that the regulator guides run in are missing and so are the screws! I found the guide channels but have not been able to find the correct screws to mount it to the glass. Does anyone have a picture of what they look like or what they used for replacements when rebuilding there door window? If anyone can help me out, I'd be very thankful!