What if a 3D roof fixture doesn't fully align with the window line?

[abg7]

Lately, I’ve been trying out several combinations of body sets and SHD 3D roof fixtures, but one combination in particular (JAG_XKR variant of the SHD 00s Euro Coupe fixture set on the '92 Evade) has been quite irksome:

If I widen the fixture to make its rear line up with the window line, the base of the A-pillar no longer aligns with the bodywork. What should I do to fix this? Should I fill in the gaps with body molding fixtures, resize the roof fixture, or choose a different 3D roof fixture in its place?

Any help regarding this would be welcome.

[Izuna]

you’d have to fill the gaps in or resize the roof if you still want to use it that is, normally when i do a build 90% of the time the roof isn’t going to be perfect at all so I’ll have to go back in and fill in the gaps or bite the bullet and pick a new roof

(i take a lot of progress pics)

as you can see here the Countach roof isn’t sitting very well on the universal wedge body, i had to go in and fill the gaps all along the sides to make it work but the end result is worth it.