I don't know if any of these photos will help in the least. I didn't do the bows, so I have no clue as to the accuracy of placement of them or them being original. Mine is a '30, 82-B, ccpu.
Hope they help.
I went out an took measurements from right down the center of the top of the cab, from bow to bow off the front header. They may not be 100% accurate, as my vision is sometimes off.
From the header to bow #1 was 6 3/4", center of #1 bow to the header.
Between bow #1 and #2, the measurement was 7 1/4", center to center of the wood.
Between Bow # 2 and #3, the measurement was 7 1/4", center to center of the wood.
From bow #3 to the rear and final wood piece support it was 7 1/2" center to center. That rear most wood piece is larger or wider than the other bows.
These bows are joined at the sides by wood and metal strips.
My visor is not riveted on or bolted on so that you can see any bolts or such.My truck has the covering over the top and I can't see what exactly is beneath.
Hope this may help you. Like say, I am not certain of the accuracy of my measurements or if this was original or not. If you need more photos of anything, let me know and I'll try to shoot some for you.