The following two pics were posted on fordbarn.com by Rusty Nelson for identification, and are shown here with his kind permission.
They are 1928-1930 'square cab' style pickup windshield frames. They are easily identified by the shaft tube for the manual windshield wiper and by the narrower 1928-1929 style swing arm brackets.
Of particular interest here is the different shapes of the end trim on the lower air deflectors.
The first pic above shows the 1928 and 1929 windshield frame with single 'squared' angle ends on the air deflector.
The second pic below shows another 1929 upper and lower frame, but also having the double angle end trim on the air deflector. The deflector itself is the same as a typical 1930/31 wind deflector.
The 1928-1929 style square cab pickup was in production until about June of 1930, well after all the new 1930 style cars were in production. The shape of the glass and lower frame were unchanged however.
It is reasonable to conclude from these pics that the 1930 deflector, which was trimmed to fit the 1930 cowl posts, would also be commonized and used on all the windshield frames produced for the square cab pickup from about January to June 1930.
Thanks to Rusty for the use of his pics, and for the discussion on fordbarn.com reaching the conclusion for this application.