Interesting. My swing arms are 12" long with 3 notches. They appear to be stock. This, combined with the shorter frame that came with the truck allow the windshield to be opened almost horizontally. I also found pics I'd taken before tearing the cab apart and there are 2 pieces of wood across the top that match the ones that came from Rodman. Judging by the holes in the bottom of the lower piece, the frame was mounted there. The wood appears to be original, although I can't be absolutely certain.
Does your truck (trucks) have the second visor under the cab visor? The one that would mount between the 2 pieces of wood and extend down to the bead of the roof visor?
Thanks again,
Roger.