Edit shellstyle to hide Header.item in all but details?

[Chozo4]

I've been fiddling with converting an XP theme (Black Mesa v2 by Valkyre) which I'd been using for a long time to work under Vista. So far so good in the elements of it I actually use at all save for one or two things thus far. The header bar for sorting is in all views... not just the details view as it used to be. It not only looks but feels rather out of place.

Is there any way to simply remove/hide it from all but the details view? I figured out how to hide it completely thus far via a negative padding but it hides it in details view too.