Chevy cab roof rear window frames
 

Just wondering if anyone can shed some info this style of rear window frame. It appears to be mounted on the outside of the roof panel. I've seen this in a few pictures.

Also can someone provide the dimensions of the frame for the wireless "talking" hole.

cutout
 

Can only comment on the early style cab 11/12 setups.

I have seen two types of cutout for the canvas " speaking tube "

On my first C8, on the cab roof panel, there is a right angled triangle shaped frame for the canvas tube to the wireless body . I still have this cab roof, can take pics if you wish .

The other type is a rectangle shaped cut out used on the C8/F8 FFW vehicles with the 1A1 body . I have drawing for this .On the FFW vehicles the cab rear glass was replaced with a metal panel, the rectangular cut out for the speaking tube has those canvas fittings .

The cutout style on your pic is new to me , never seen it before

After the WS19 set became available you would think the speaking tube would be obsolete because the WS 19 has the crew intercom facility :confused