There is more than one place for adjustment on the convertible top ,the aluminum header can be adjusted forward or back ,the main pivot is also an adjustable area ,it is a cam bolt with an allen head stud ,it not only adjust the front forward and back but also adjust the bow of the sides to fit to the door glass . If the top is not installed and just trying to fit the frame you will find it will fit different when the new top is installed and will have to be adjusted again more than likely