The windshield to cab fit is not that exact to begin with. The total width of the frame is not adjustable, if you re-connect the 2 halves with the original connector plates and the center divider fits like its supposed to, your finished width is what you got and all you can adjust is centering the entire unit. As for upper and lower fit of the rubber to the cab, the edge of the rubber should sit on the outer cab surface and not into the first recess, however its not a great fit at best and don't expect a water tight seal.
