Finally got new top on today

How much front/rear adjustment is there on convertible tops? The reason I ask is that the distance from the bottom of the glass to the dutchman panel varies quite a bit on cars I've seen. Some have a lot of material below the glass like yours but others have a lot less.

I know the last bow has to sit 24 1/2" from the dutchman panel. The variation may be on the supplyer of the tops. My top came from Legendary Interiors.