On a related note, I have replaced the glass in two 37 front windshields. Both times I twisted off some of the screws, 4 in one frame, 3 in the other. Point being, be REAL careful and patient. Soak all the screws with a good penetrant and wait for a couple days. Heat may also help. It ain't no fun to drill out the old stubs and re-thread them. In addition to the screws that hold on the hinges, there are screws on the side of the frame that hold a square metal bar in place. I managed to break off some of those screws. In one case, things got so buggered that I decided to remove the bar. I cut the bar in half where the two piece of the frame come together. I recall it was 1/4" square stock. Getting the old pieces out was terrible, a much longer story...
gregg