Post to Hardtop conversion

I'm not 100% sure, but I think that the post and hardtop models have a different height roof. You could get the look of a hardtop by taking the post out, but a full conversion would probably require an entire roof transplant. I have some windshield trim that is about 1-2 inches longer on the A pillar than my hardtop car and was told that it fits the 4 door or post model as they both have a longer windshield and taller roof.