Convertible top adjustment 86 XJS V-12

I am starting a new topic on my 86 XJS convertible V-12. My convertible top is about 3/8" short of latching. I know I can adjust the latches, they are extended as far as they can go and they are still a little short. Can the top be adjusted to close the gap at the windshied header. I installed new cylinders but the top was that way before the installation too. Thanks in advance. Rod