The instuctions for my Robbins top said 22 1/2" in the middle with the well trim chrome on. Some advice: use 2 spacer sticks from the back header bow to the next one. As you put the side pads on, the material will strtech and the window will stretch. Had to do mine 2X before I used the spacer sticks. They are in the folding top manual below.
I didn't get any pics of my front bow before I glued the final top material over my staples. But there is a diagram in the fisher body manual sect. 13 page 13-19 of how it all goes together.
